9/25/2016 Topic Print View
Week 3: Network Design Discussion
Network Design—Minicase (graded)
Computer dynamics is a microcomputer software development company that has a 300computer network. The company is located in three adjacent five
story buildings in an office park with about 100 computers in each building. The LANs in each building are similar, but one building has the data center in
the second floor. There are no other office locations. Please refer to the network architecture components in Figure 61 of the textbook, and identify the
key network architecture components in the design of the enterprise network. Refer to Chapter 6 and discuss how you would go about designing the
physical network. You may assume that the campus does not need WAN connectivity.
Responses
Response Author Date/Time
Network Design Professor Gander 9/10/2016 9:11:59 PM
Class, what is a logical design? How is logical network design different from the physical network design?
RE: Network Design Tonya Blevins 9/11/2016 4:48:18 PM
Logical modeling deals with gathering business requirements and converting those requirements into a model. The logical
model revolves around the needs of the business, not the database, although the needs of the business are used to establish
the needs of the database. Logical modeling involves gathering information about business processes, business entities, and
organizational units. After this information is gathered, diagrams and reports are produced including entity relationship
diagrams, business process diagrams, and eventually process 言ᘅlow diagrams.
Physical modeling involves the actual design of a database according to the requirements that were established during logical modeling.
Logical modeling mainly involves gathering the requirements of the business, with the latter part of logical modeling directed toward
the goals and requirements of the database. Physical modeling deals with the conversion of the logical, or business model, into a
relational database model. When physical modeling occurs, objects are being de言ᘅined at the schema level. A schema is a group of related
objects in a database. A database design effort is normally associated with one schema. During physical modeling, objects such as tables
and columns are created based on entities and attributes that were de言ᘅined during logical modeling. Constraints are also de言ᘅined,
including primary keys, foreign keys, other unique keys, and check constraints.
https://docs.oracle.com/cd/A87860_01/doc/server.817/a76994/physical.htm
https://docs.oracle.com/cd/A87860_01/doc/server.817/a76994/logical.htm
RE: Network Design Carlos Flores 9/14/2016 9:38:06 PM
Great post Tonya, the differences are clear here. The logical takes us through the design of what collecting data and doing
something with it. The data contains needs of the business and those needs become physical later on. This is the smart way to go
about designing and we can use it in many other arts as well.
RE: Network Design Elh Ibrahima Barry 9/11/2016 6:51:03 PM
A logical network design is a statement of the network elements needed to meet the needs of the organization. The logical design does not
specify technologies or products to be used (although any specific requirements are noted). Instead, it focuses on the fundamental
functionality needed, such as a highspeed access network, which in the technology design stage will be translated into specific technologies
(e.g., switched 100BaseT). Once the needs have been defined in the logical network design, the next step is to develop a physical network
design. The physical network design starts with the client and server computers needed to support the users and applications. If the network
is a new network, new computers will need to be purchased. If the network is an existing network, the servers may need to be upgraded to
the newest technology. Once these are designed, then the circuits and devices connecting them are designed.
Reference:
FitzGerald, Jerry, Alan Dennis, Alexandra Durcikova. Business Data Communications and Networking, 12th Edition. Wiley, 2015. VitalSource
Bookshelf Online.
RE: Network Design Winifred Oloni 9/11/2016 8:19:50 PM
Logical Network
Logical network is logical addressing used to describe a network or other networks it connects to. The layout shows the IP Addresses
associated with each part of the network. In most cases, the logical network is a simple Class C network such as 192.168.0.0 with the
default subnet mask of 255.255.255.0. This network allows up to 254 hosts to be connected directly to it without the need of any routing.
http://threadcontent.next.ecollege.com/(NEXT(9aa8e367917140bc999f3323f7766024))/Main/CourseMode/Topic/TopicPrintView.ed?topicID=9000009367938&so… 1/21
,9/25/2016 Topic Print View
During network design, growth and expansion need to be taken into account to avoid problems such as running out of available IP
Addresses.
Physical design
Physical design, refers to the actual layout of the physical part of our network. This includes the cables, switches, workstations etc. A physical
layout/map usually involves a diagram of the actual floor the way it would be seen if you were on the ceiling, looking down towards to the
floor.
http://searchnetworking.techtarget.com/answer/Whatisthedifferencebetweenphysicaldesignandlogicaldesignofanetwork
RE: Network Design Omolabake Dawodu 9/12/2016 5:57:44 PM
Logical network design is the part of the design phase of the System Development Life
Cycle (SDLC) in which all functional features of the system chosen for development in
analysis are independently described the platform of the computer. A logical network
is not necessarily the same with the physical design. Logical designs communicate
with abstract such as a network, router or workstation, and an important aspect of a
logical network design is that it is [art of the requirements set for a solution to a
customer problem.
http://www.thario.net/2005/09/explaindifferencebetweenlogical.html
RE: Network Design Aaron DeBarr 9/14/2016 5:33:39 PM
Logical design is an abstract concept in computer programming by which programmers arrange data in a series of logical
relationships known as attributes or entities. An entity refers to a chunk of information, whereas an attribute defines the
unique properties of an entity.
Ref
https://www.reference.com/worldview/logicaldesign28c3ff96fc6661a2#
RE: Network Design Melody Barnhill 9/11/2016 9:38:08 PM
A logical design is the CONCEPTUAL BLUEPRINT of a software application, illustrating entities, relationships, rules,
and processes.
The logical design tells the developer what processes the application must support, and are usually very detailed. All
software applications model some process, most support hundreds.
RE: Network Design Leslie Thames 9/12/2016 1:23:05 PM
Before considering the best cabling system grade for your network, logical network design goals must be determined. Once logical
network design goals have been outlined, work on physical network infrastructure design can begin. Logical network design involves
assessing the needs for a network and serves as the basis for physical network infrastructure design. Logical network design
depends on the needs of the users of the network. The most basic issues that your logical network design will address are what the
users are doing on the network and how the applications will use the network in the immediate and distant future. The lifecycle of
the applications will have an impact on the creation of stable systems. If an existing network is in place, plans on how will it be
transitioned to a new network should include data preservation and security. Applicationspecific information includes optimal
throughput speed for each application as well as the type of protocols to be used.
http://www.siemon.com/logicalnetwork.asp
RE: Network Design Christopher Grindey 9/12/2016 9:45:35 AM
A logical network design is produced from a needs analysis and lays out the network elements needed to meet the requirements of the
organization. This design does not detail products or technologies needed, rather it specifies the functionality required, such as high speed
access. In contrast, the physical network design begins with the server and client computers needed to set up the network, if a network exists,
then what is needed to be upgraded. After this has been accomplished, the devices and circuits that will connect the computers, can be
designed.
[Fitz2014] Jerry Fitzgerald: Alan Dennis: Alexandra Durchikova. Business Data Communications and Networking, 12th Edition. Retrieved on
Sept 12, 2016 from https://devry.vitalsource.com/#/books/9781119127857/cfi/6/18!/4/2/14/6/2@0:83.6
RE: Network Design Shauna Allen 9/12/2016 2:16:03 PM
http://threadcontent.next.ecollege.com/(NEXT(9aa8e367917140bc999f3323f7766024))/Main/CourseMode/Topic/TopicPrintView.ed?topicID=9000009367938&so… 2/21
, 9/25/2016 Topic Print View
First, perform the needs analysis. Figure out why they need the network to be built, who will use it, and with which applications. Decide on
the network architecture component. Make sure all buildings are the same LAN rather than just similar. Streamline it. Since there are no
other office locations, the LAN should suffice, but having them all the be on the same network may help with some issues. HOWEVER, can it
be said that if they are on different networks, if one goes down then not the whole company goes down, but just the one that is down? I am
not sure, yet, which would be the better option.
Defined: Logical design is an abstract concept in computer programming by which programmers arrange data in a series of logical
relationships known as attributes or entities. An entity refers to a chunk of information, whereas an attribute defines the unique properties of
an entity.
Differences between logical and physical network design:
"A logical design for a network is an abstract functional specification for a telecommunications solution. A logical design lacks specific details
such as technologies and standards and focuses on the needs at a general level. A logical network design can be a view of any part of a
network. Logical designs communicate with abstract concepts, such as a network, router or workstation, without specifying concrete details.
The primary difference between logical network design and physical network design is that of iterative production of a solution
from the identification of a problem" (http://www.thario.net/2005/09/explaindifferencebetweenlogical.html).
RE: Network Design Karly Derosena 9/13/2016 12:49:22 AM
Logical design is an abstract concept in computer programming by which programmers arrange data in a series
of logical relationships known as attributes or entities. An entity refers to a chunk of information, whereas an attribute
defines the unique properties of an entity.
RE: Network Design Jermaine Huggins 9/13/2016 12:51:15 PM
Figure 61 is recommended in the minicase, (and is helpful) but I also found 64 to be quite pertinent as well. (Fitzgerald, Dennis, &
Durcikova, 2015) One assumption I used was the symmetrical spread of the 100 computers per building – with 5 floors, I would set 20 per
floor, which would mean that we could get away with one LAN per floor as well. (Fitzgerald, Dennis, & Durcikova, 2015) All LANs would be
connected to a building backbone running the height of the building, which itself would be connected to a campus backbone keeping all three
buildings on the same page. The only caveat would be that data center on the second floor of (what I will arbitrarily call) HQ this would,
following along with Figure 65 of the text, mean that an additional switch (10 Gbps perhaps to keep with the text example) would need to
be dedicated to the data center itself, along with the smaller order 1 Gbps switches on each floor making sure the LANs are up to snuff and
not presenting bottlenecks. Of course, we could raise both type of switches up a notch, and make the LAN switches 40 and the data center
have a faster 100 Gbps switch, but only if the business need/cost tradeoffs are deemed acceptable. 40 or 100 Gbps routers would also be
present at each building to handle plugging into the campus core backbone, again allaying any bottleneck fears at this rung of the
information ladder.
References
Fitzgerald, J., Dennis, A., & Durcikova, A. (2015). Business Data Communications and Networking. Wiley & Sons.
RE: Network Design Jermaine Huggins 9/16/2016 9:43:23 PM
Your design for this mini case is what I believe recommended and best business practice. Dividing the number of host per floor can
certainly keep the network balanced and prevent bottlenecks. Of course we have to take into consideration which
department(floors) will have more data moving in and out the network and perhaps designate that department as a high traffic
LAN/VLAN. My only concern is the building with the data center located on the second floor. Will the load of the network (weight)
be properly supported/architectural challenge? is coolingHVAC sufficient?is there elevator access to move equipment in and out
with ease?
RE: Network Design Cheikh Kebe 9/13/2016 2:00:44 PM
Logical design is Software setup. The goal of the needs analysis step is to produce a logical network design, which is a
statement of the network elements needed to meet the needs of the organization. The logical design does not specify
technologies or products to be used (although any specific requirements are noted). Instead, it focuses on the
fundamental functionality needed, such as a highspeed access network, which in the technology design stage will be
translated into specific technologies. Once the needs have been defined in the logical network design, the next step is
to develop a physical network design (or set of possible designs). The physical network design starts with the client and
server computers needed to support the users and applications. If the network is a new network, new computers will
need to be purchased. If the network is an existing network, the servers may need to be upgraded to the newest
technology.
Thank you!
Cheikh
http://threadcontent.next.ecollege.com/(NEXT(9aa8e367917140bc999f3323f7766024))/Main/CourseMode/Topic/TopicPrintView.ed?topicID=9000009367938&so… 3/21
Week 3: Network Design Discussion
Network Design—Minicase (graded)
Computer dynamics is a microcomputer software development company that has a 300computer network. The company is located in three adjacent five
story buildings in an office park with about 100 computers in each building. The LANs in each building are similar, but one building has the data center in
the second floor. There are no other office locations. Please refer to the network architecture components in Figure 61 of the textbook, and identify the
key network architecture components in the design of the enterprise network. Refer to Chapter 6 and discuss how you would go about designing the
physical network. You may assume that the campus does not need WAN connectivity.
Responses
Response Author Date/Time
Network Design Professor Gander 9/10/2016 9:11:59 PM
Class, what is a logical design? How is logical network design different from the physical network design?
RE: Network Design Tonya Blevins 9/11/2016 4:48:18 PM
Logical modeling deals with gathering business requirements and converting those requirements into a model. The logical
model revolves around the needs of the business, not the database, although the needs of the business are used to establish
the needs of the database. Logical modeling involves gathering information about business processes, business entities, and
organizational units. After this information is gathered, diagrams and reports are produced including entity relationship
diagrams, business process diagrams, and eventually process 言ᘅlow diagrams.
Physical modeling involves the actual design of a database according to the requirements that were established during logical modeling.
Logical modeling mainly involves gathering the requirements of the business, with the latter part of logical modeling directed toward
the goals and requirements of the database. Physical modeling deals with the conversion of the logical, or business model, into a
relational database model. When physical modeling occurs, objects are being de言ᘅined at the schema level. A schema is a group of related
objects in a database. A database design effort is normally associated with one schema. During physical modeling, objects such as tables
and columns are created based on entities and attributes that were de言ᘅined during logical modeling. Constraints are also de言ᘅined,
including primary keys, foreign keys, other unique keys, and check constraints.
https://docs.oracle.com/cd/A87860_01/doc/server.817/a76994/physical.htm
https://docs.oracle.com/cd/A87860_01/doc/server.817/a76994/logical.htm
RE: Network Design Carlos Flores 9/14/2016 9:38:06 PM
Great post Tonya, the differences are clear here. The logical takes us through the design of what collecting data and doing
something with it. The data contains needs of the business and those needs become physical later on. This is the smart way to go
about designing and we can use it in many other arts as well.
RE: Network Design Elh Ibrahima Barry 9/11/2016 6:51:03 PM
A logical network design is a statement of the network elements needed to meet the needs of the organization. The logical design does not
specify technologies or products to be used (although any specific requirements are noted). Instead, it focuses on the fundamental
functionality needed, such as a highspeed access network, which in the technology design stage will be translated into specific technologies
(e.g., switched 100BaseT). Once the needs have been defined in the logical network design, the next step is to develop a physical network
design. The physical network design starts with the client and server computers needed to support the users and applications. If the network
is a new network, new computers will need to be purchased. If the network is an existing network, the servers may need to be upgraded to
the newest technology. Once these are designed, then the circuits and devices connecting them are designed.
Reference:
FitzGerald, Jerry, Alan Dennis, Alexandra Durcikova. Business Data Communications and Networking, 12th Edition. Wiley, 2015. VitalSource
Bookshelf Online.
RE: Network Design Winifred Oloni 9/11/2016 8:19:50 PM
Logical Network
Logical network is logical addressing used to describe a network or other networks it connects to. The layout shows the IP Addresses
associated with each part of the network. In most cases, the logical network is a simple Class C network such as 192.168.0.0 with the
default subnet mask of 255.255.255.0. This network allows up to 254 hosts to be connected directly to it without the need of any routing.
http://threadcontent.next.ecollege.com/(NEXT(9aa8e367917140bc999f3323f7766024))/Main/CourseMode/Topic/TopicPrintView.ed?topicID=9000009367938&so… 1/21
,9/25/2016 Topic Print View
During network design, growth and expansion need to be taken into account to avoid problems such as running out of available IP
Addresses.
Physical design
Physical design, refers to the actual layout of the physical part of our network. This includes the cables, switches, workstations etc. A physical
layout/map usually involves a diagram of the actual floor the way it would be seen if you were on the ceiling, looking down towards to the
floor.
http://searchnetworking.techtarget.com/answer/Whatisthedifferencebetweenphysicaldesignandlogicaldesignofanetwork
RE: Network Design Omolabake Dawodu 9/12/2016 5:57:44 PM
Logical network design is the part of the design phase of the System Development Life
Cycle (SDLC) in which all functional features of the system chosen for development in
analysis are independently described the platform of the computer. A logical network
is not necessarily the same with the physical design. Logical designs communicate
with abstract such as a network, router or workstation, and an important aspect of a
logical network design is that it is [art of the requirements set for a solution to a
customer problem.
http://www.thario.net/2005/09/explaindifferencebetweenlogical.html
RE: Network Design Aaron DeBarr 9/14/2016 5:33:39 PM
Logical design is an abstract concept in computer programming by which programmers arrange data in a series of logical
relationships known as attributes or entities. An entity refers to a chunk of information, whereas an attribute defines the
unique properties of an entity.
Ref
https://www.reference.com/worldview/logicaldesign28c3ff96fc6661a2#
RE: Network Design Melody Barnhill 9/11/2016 9:38:08 PM
A logical design is the CONCEPTUAL BLUEPRINT of a software application, illustrating entities, relationships, rules,
and processes.
The logical design tells the developer what processes the application must support, and are usually very detailed. All
software applications model some process, most support hundreds.
RE: Network Design Leslie Thames 9/12/2016 1:23:05 PM
Before considering the best cabling system grade for your network, logical network design goals must be determined. Once logical
network design goals have been outlined, work on physical network infrastructure design can begin. Logical network design involves
assessing the needs for a network and serves as the basis for physical network infrastructure design. Logical network design
depends on the needs of the users of the network. The most basic issues that your logical network design will address are what the
users are doing on the network and how the applications will use the network in the immediate and distant future. The lifecycle of
the applications will have an impact on the creation of stable systems. If an existing network is in place, plans on how will it be
transitioned to a new network should include data preservation and security. Applicationspecific information includes optimal
throughput speed for each application as well as the type of protocols to be used.
http://www.siemon.com/logicalnetwork.asp
RE: Network Design Christopher Grindey 9/12/2016 9:45:35 AM
A logical network design is produced from a needs analysis and lays out the network elements needed to meet the requirements of the
organization. This design does not detail products or technologies needed, rather it specifies the functionality required, such as high speed
access. In contrast, the physical network design begins with the server and client computers needed to set up the network, if a network exists,
then what is needed to be upgraded. After this has been accomplished, the devices and circuits that will connect the computers, can be
designed.
[Fitz2014] Jerry Fitzgerald: Alan Dennis: Alexandra Durchikova. Business Data Communications and Networking, 12th Edition. Retrieved on
Sept 12, 2016 from https://devry.vitalsource.com/#/books/9781119127857/cfi/6/18!/4/2/14/6/2@0:83.6
RE: Network Design Shauna Allen 9/12/2016 2:16:03 PM
http://threadcontent.next.ecollege.com/(NEXT(9aa8e367917140bc999f3323f7766024))/Main/CourseMode/Topic/TopicPrintView.ed?topicID=9000009367938&so… 2/21
, 9/25/2016 Topic Print View
First, perform the needs analysis. Figure out why they need the network to be built, who will use it, and with which applications. Decide on
the network architecture component. Make sure all buildings are the same LAN rather than just similar. Streamline it. Since there are no
other office locations, the LAN should suffice, but having them all the be on the same network may help with some issues. HOWEVER, can it
be said that if they are on different networks, if one goes down then not the whole company goes down, but just the one that is down? I am
not sure, yet, which would be the better option.
Defined: Logical design is an abstract concept in computer programming by which programmers arrange data in a series of logical
relationships known as attributes or entities. An entity refers to a chunk of information, whereas an attribute defines the unique properties of
an entity.
Differences between logical and physical network design:
"A logical design for a network is an abstract functional specification for a telecommunications solution. A logical design lacks specific details
such as technologies and standards and focuses on the needs at a general level. A logical network design can be a view of any part of a
network. Logical designs communicate with abstract concepts, such as a network, router or workstation, without specifying concrete details.
The primary difference between logical network design and physical network design is that of iterative production of a solution
from the identification of a problem" (http://www.thario.net/2005/09/explaindifferencebetweenlogical.html).
RE: Network Design Karly Derosena 9/13/2016 12:49:22 AM
Logical design is an abstract concept in computer programming by which programmers arrange data in a series
of logical relationships known as attributes or entities. An entity refers to a chunk of information, whereas an attribute
defines the unique properties of an entity.
RE: Network Design Jermaine Huggins 9/13/2016 12:51:15 PM
Figure 61 is recommended in the minicase, (and is helpful) but I also found 64 to be quite pertinent as well. (Fitzgerald, Dennis, &
Durcikova, 2015) One assumption I used was the symmetrical spread of the 100 computers per building – with 5 floors, I would set 20 per
floor, which would mean that we could get away with one LAN per floor as well. (Fitzgerald, Dennis, & Durcikova, 2015) All LANs would be
connected to a building backbone running the height of the building, which itself would be connected to a campus backbone keeping all three
buildings on the same page. The only caveat would be that data center on the second floor of (what I will arbitrarily call) HQ this would,
following along with Figure 65 of the text, mean that an additional switch (10 Gbps perhaps to keep with the text example) would need to
be dedicated to the data center itself, along with the smaller order 1 Gbps switches on each floor making sure the LANs are up to snuff and
not presenting bottlenecks. Of course, we could raise both type of switches up a notch, and make the LAN switches 40 and the data center
have a faster 100 Gbps switch, but only if the business need/cost tradeoffs are deemed acceptable. 40 or 100 Gbps routers would also be
present at each building to handle plugging into the campus core backbone, again allaying any bottleneck fears at this rung of the
information ladder.
References
Fitzgerald, J., Dennis, A., & Durcikova, A. (2015). Business Data Communications and Networking. Wiley & Sons.
RE: Network Design Jermaine Huggins 9/16/2016 9:43:23 PM
Your design for this mini case is what I believe recommended and best business practice. Dividing the number of host per floor can
certainly keep the network balanced and prevent bottlenecks. Of course we have to take into consideration which
department(floors) will have more data moving in and out the network and perhaps designate that department as a high traffic
LAN/VLAN. My only concern is the building with the data center located on the second floor. Will the load of the network (weight)
be properly supported/architectural challenge? is coolingHVAC sufficient?is there elevator access to move equipment in and out
with ease?
RE: Network Design Cheikh Kebe 9/13/2016 2:00:44 PM
Logical design is Software setup. The goal of the needs analysis step is to produce a logical network design, which is a
statement of the network elements needed to meet the needs of the organization. The logical design does not specify
technologies or products to be used (although any specific requirements are noted). Instead, it focuses on the
fundamental functionality needed, such as a highspeed access network, which in the technology design stage will be
translated into specific technologies. Once the needs have been defined in the logical network design, the next step is
to develop a physical network design (or set of possible designs). The physical network design starts with the client and
server computers needed to support the users and applications. If the network is a new network, new computers will
need to be purchased. If the network is an existing network, the servers may need to be upgraded to the newest
technology.
Thank you!
Cheikh
http://threadcontent.next.ecollege.com/(NEXT(9aa8e367917140bc999f3323f7766024))/Main/CourseMode/Topic/TopicPrintView.ed?topicID=9000009367938&so… 3/21
