CNT 4007 Exam 1 with 100% Correct
Answers
What is the "nuts and bolts" view of the Internet? - ANS--A network of networks
-A collection of hardware and software components executing protocols that define the
format and the order of messages exchanged between two or more communicating
entities, as well as the actions taken on the transmission and/or receipt of a message or
other event.
-A collection of billions of computing devices, and packet switches interconnected by
links.
What makes the internet a service? - ANS--A platform for building network applications.
-A place I go for information, entertainment, and to communicate with people.
Give examples of Human Based protocols - ANS--Two people introducing themselves
to each other.
-A student raising her/his hand to ask a really insightful question, followed by the
teaching acknowledging the student, listening carefully to the question, and responding
with a clear, insightful answer. And then thanking the student for the question, since
teachers love to get questions.
-One person asking, and getting, the time to/from another person.
Access network per-subscriber speeds. Match the access network with the approximate
speeds that a subscriber might experience. (Note: if you look these up, do so in the 8E
textbook, slides,or video -- not in the 7E or earlier versions, since link access speeds
are always increasing over the years). - ANS-1)Ethernet - Wired. Up to 100's Gbps per
link.
2)4G cellular LTE - Wireless. Up to 10's Mbps per device.
3)802.11 WiFi- Wireless. 10's to 100's of Mbps per device.
4)Cable access network- Wired. Up to 10's to 100's of Mbps downstream per user.
5)Digital Subscriber Line-Wired. Up to 10's of Mbps downstream per user.
Match the name of an Internet layer with unit of data that is exchanged among protocol
entities at that layer
Application layer
Transport layer
Network layer
Link layer
Physical layer - ANS-Message
Segment
, Datagram
Frame
Bit
What is meant by the term "encapsulation" - ANS-Taking data from the layer above,
adding header fields appropriate for this layer, and then placing the data in the payload
field of the "packet" for that layer.
Firewall - ANS-A part of a computer system or network that is designed to block
unauthorized access while permitting outward communication, or specialized
"middleboxes" filtering or blocking traffic, inspecting packet contents inspections
Encryption - ANS-Process of converting readable data into unreadable characters to
prevent unauthorized access.
Digital signatures - ANS-Electronic certificates that are used to authenticate the validity
of individuals and companies conducting business electronically, or used to detect
tampering/changing of message contents and to identify the originator of a message.
Access control - ANS-In security terms, the process of determining and assigning
privileges to various resources, objects, and data.
Authentication - ANS-Verifying the identity of the person or device attempting to access
the system
Characteristics associated with client-server approach to structuring network
applications (as opposed to a P2P approach)? - ANS-HTTP uses this application
structure.
There is a server with a well known server IP address.
There is a server that is always on.
Characteristics associated with a P2P approach to structuring network applications (as
opposed to a client-server approach)? - ANS-There is not a server that is always on.
A process requests service from those it contacts and will provide service to processes
that contact it.
When an application uses a UDP socket, what transport services are provided to the
application by UDP? - ANS-Best effort service. The service will make a best effort to
deliver data to the destination but makes no guarantees that any particular segment of
data will actually get there.
When an application uses a TCP socket, what transport services are provided to the
application by TCP? - ANS--Congestion control. The service will control senders so that
the senders do not collectively send more data than links in the network can handle.
-Loss-free data transfer. The service will reliably transfer all data to the receiver,
recovering from packets dropped in the network due to router buffer overflow.
Answers
What is the "nuts and bolts" view of the Internet? - ANS--A network of networks
-A collection of hardware and software components executing protocols that define the
format and the order of messages exchanged between two or more communicating
entities, as well as the actions taken on the transmission and/or receipt of a message or
other event.
-A collection of billions of computing devices, and packet switches interconnected by
links.
What makes the internet a service? - ANS--A platform for building network applications.
-A place I go for information, entertainment, and to communicate with people.
Give examples of Human Based protocols - ANS--Two people introducing themselves
to each other.
-A student raising her/his hand to ask a really insightful question, followed by the
teaching acknowledging the student, listening carefully to the question, and responding
with a clear, insightful answer. And then thanking the student for the question, since
teachers love to get questions.
-One person asking, and getting, the time to/from another person.
Access network per-subscriber speeds. Match the access network with the approximate
speeds that a subscriber might experience. (Note: if you look these up, do so in the 8E
textbook, slides,or video -- not in the 7E or earlier versions, since link access speeds
are always increasing over the years). - ANS-1)Ethernet - Wired. Up to 100's Gbps per
link.
2)4G cellular LTE - Wireless. Up to 10's Mbps per device.
3)802.11 WiFi- Wireless. 10's to 100's of Mbps per device.
4)Cable access network- Wired. Up to 10's to 100's of Mbps downstream per user.
5)Digital Subscriber Line-Wired. Up to 10's of Mbps downstream per user.
Match the name of an Internet layer with unit of data that is exchanged among protocol
entities at that layer
Application layer
Transport layer
Network layer
Link layer
Physical layer - ANS-Message
Segment
, Datagram
Frame
Bit
What is meant by the term "encapsulation" - ANS-Taking data from the layer above,
adding header fields appropriate for this layer, and then placing the data in the payload
field of the "packet" for that layer.
Firewall - ANS-A part of a computer system or network that is designed to block
unauthorized access while permitting outward communication, or specialized
"middleboxes" filtering or blocking traffic, inspecting packet contents inspections
Encryption - ANS-Process of converting readable data into unreadable characters to
prevent unauthorized access.
Digital signatures - ANS-Electronic certificates that are used to authenticate the validity
of individuals and companies conducting business electronically, or used to detect
tampering/changing of message contents and to identify the originator of a message.
Access control - ANS-In security terms, the process of determining and assigning
privileges to various resources, objects, and data.
Authentication - ANS-Verifying the identity of the person or device attempting to access
the system
Characteristics associated with client-server approach to structuring network
applications (as opposed to a P2P approach)? - ANS-HTTP uses this application
structure.
There is a server with a well known server IP address.
There is a server that is always on.
Characteristics associated with a P2P approach to structuring network applications (as
opposed to a client-server approach)? - ANS-There is not a server that is always on.
A process requests service from those it contacts and will provide service to processes
that contact it.
When an application uses a UDP socket, what transport services are provided to the
application by UDP? - ANS-Best effort service. The service will make a best effort to
deliver data to the destination but makes no guarantees that any particular segment of
data will actually get there.
When an application uses a TCP socket, what transport services are provided to the
application by TCP? - ANS--Congestion control. The service will control senders so that
the senders do not collectively send more data than links in the network can handle.
-Loss-free data transfer. The service will reliably transfer all data to the receiver,
recovering from packets dropped in the network due to router buffer overflow.
