CS3622 Data Communications Exam 1
Identify the five components of a data communications system. - ANS-message, sender,
receiver, medium, and protocol.
What are the advantages of distributed processing? - ANS-The work load isn't dependent on
one computer. This improves performance, reliability, and security.
What are the three criteria necessary for an effective and efficient network? - ANS-performance,
reliability, security
What are the advantages of a multipoint connection over a point-to-point connection? -
ANS-Multipoint provides more reliability
What are the two types of line configuration? - ANS-point-to-point
multipoint
Categorize the four basic topologies in terms of line configuration - ANS-point-to-point : mesh,
star, ring
multipoint : bus
What is the difference between half-duplex and full-duplex transmission modes? -
ANS-half-duplex allows both nodes to transmit and receive, but not at the same time.
full-duplex allows nodes to transmit and receive simultaneously.
Name the four basic network topologies, and cite an advantage of each type. - ANS-Mesh:
-manages high amounts of traffic,
- robust. failure of one device does not cause failure of others,
-easy fault identification and fault isolation
Star:
-less expensive than mesh
-easy to install and reconfigure
-robustness. if one link fails, only that link is affected.
Bus:
-easy installation
-less cable length than star
Ring:
-easy to install and reconfigure
, -high speed
-reduced chance of packet collisions
For n devices in a network, what is the number of cable links required for a mesh, ring, bus, and
star topology? - ANS-where n is number of devices:
mesh : n(n-1)/2
ring: n
bus : n + 1 (n for cables, 1 for backbone)
star: n
What are some of the factors that determine whether a communication system is a LAN or
WAN? - ANS-size (geographical area)
What is an internet? What is the Internet? - ANS-The internet is a general term for an
interconnected network, while the Internet refers to a specific worldwide internetwork.
Why are protocols needed? - ANS-Protocols are set of rules and standards which are used to
facilitate timely and accurate communication between multiple devices with different
configurations.
Why are standards needed? - ANS-Standards are needed to create and maintain an open and
competitive market for manufacturers to coordinate protocol rules, and thus guarantee
compatibility of data communication technologies.
List the layers of the Internet model - ANS-Application
Presentation
Session
Transport
Data Link
Network
Physical
Which layers in the Internet model are the network support layers? - ANS-Physical
Network
Data Link
Which layer in the Internet model is the user support layer? - ANS-Application
Session
Presentation
What is the difference between network layer delivery and transport layer delivery? -
ANS-Network layer is responsible for delivery of packets
Transport layer is responsible for delivery of messages
Identify the five components of a data communications system. - ANS-message, sender,
receiver, medium, and protocol.
What are the advantages of distributed processing? - ANS-The work load isn't dependent on
one computer. This improves performance, reliability, and security.
What are the three criteria necessary for an effective and efficient network? - ANS-performance,
reliability, security
What are the advantages of a multipoint connection over a point-to-point connection? -
ANS-Multipoint provides more reliability
What are the two types of line configuration? - ANS-point-to-point
multipoint
Categorize the four basic topologies in terms of line configuration - ANS-point-to-point : mesh,
star, ring
multipoint : bus
What is the difference between half-duplex and full-duplex transmission modes? -
ANS-half-duplex allows both nodes to transmit and receive, but not at the same time.
full-duplex allows nodes to transmit and receive simultaneously.
Name the four basic network topologies, and cite an advantage of each type. - ANS-Mesh:
-manages high amounts of traffic,
- robust. failure of one device does not cause failure of others,
-easy fault identification and fault isolation
Star:
-less expensive than mesh
-easy to install and reconfigure
-robustness. if one link fails, only that link is affected.
Bus:
-easy installation
-less cable length than star
Ring:
-easy to install and reconfigure
, -high speed
-reduced chance of packet collisions
For n devices in a network, what is the number of cable links required for a mesh, ring, bus, and
star topology? - ANS-where n is number of devices:
mesh : n(n-1)/2
ring: n
bus : n + 1 (n for cables, 1 for backbone)
star: n
What are some of the factors that determine whether a communication system is a LAN or
WAN? - ANS-size (geographical area)
What is an internet? What is the Internet? - ANS-The internet is a general term for an
interconnected network, while the Internet refers to a specific worldwide internetwork.
Why are protocols needed? - ANS-Protocols are set of rules and standards which are used to
facilitate timely and accurate communication between multiple devices with different
configurations.
Why are standards needed? - ANS-Standards are needed to create and maintain an open and
competitive market for manufacturers to coordinate protocol rules, and thus guarantee
compatibility of data communication technologies.
List the layers of the Internet model - ANS-Application
Presentation
Session
Transport
Data Link
Network
Physical
Which layers in the Internet model are the network support layers? - ANS-Physical
Network
Data Link
Which layer in the Internet model is the user support layer? - ANS-Application
Session
Presentation
What is the difference between network layer delivery and transport layer delivery? -
ANS-Network layer is responsible for delivery of packets
Transport layer is responsible for delivery of messages
