Week 9 Summary

Question 1

ICMP messages are carried within the payload of IP datagrams.

Answer 1

TRUE

Question 2

In network graph terminology, [a] represent routers.

Answer 2

Nodes

Question 3

For a TCP/IP datagram leaving a home network through a NAPT device, which of the following header fields (IP and/or TCP) are altered?
Source IP Address
Source Port
Header Checksum

Answer 3

TRUE

Question 4

It is the responsibility of a routing algorithm to correlate MAC addresses with IP addresses.

Answer 4

FALSE

Question 5

Network address translation has ameliorated the IP address shortage problem.

Answer 5

TRUE

Question 6

For a TCP/IP datagram coming into a home network through a NAPT device, which of the following header fields (IP and/or TCP) are altered? (Check all that apply)
Destination Port
Destination IP address
Header Checksum

Answer 6

TRUE

Question 7

If an IP datagram is fragmented into 1000-byte fragments, and later encounters a link with an 800-byte MTU, a special procedure (other than standard IP fragmentation) must be used.

Answer 7

FALSE

Question 8

The path MTU is the smallest MTU on a path from sender to receiver.

Answer 8

TRUE

Question 9

Select all features explicit in IPv6 which are not explicitly available in IPv4. 
 Flow Labeling
 128-bit Addresses
 Extension Headers
 Payload Length

Answer 9

TRUE

Question 10

When encountering an IPv4-only router, an IPv6 datagram is [ Select ] an IPv4 datagram, with the [ Select ] as its destination.

encapsulated in

next in-line IPv6 router

Answer 10

TRUE

Question 11

In IPv6, there is no datagram fragmentation performed in the network core..

Answer 11

TRUE

Question 12

It is the responsibility of a routing algorithm to determine a datagram’s next hop information.

Answer 12

TRUE

Question 13

In IPv6, datagram fragmentation is handled at the

Answer 13

network edge

Question 14

Already available in IPv4

Answer 14

Source/Destination Address, Hop Limit, Version, Traffic Type,

Question 15

Random Access Schemes

Answer 15

ALOHA, CSMA

Question 16

It is the responsibility of a routing algorithm to find a datagram’s path through a network.

Answer 16

TRUE

Question 17

A link-layer link between only two adjacent nodes is called a/an point to point link.

Answer 17

TRUE

Question 18

To retrieve an adjacent node’s MAC address, ______ is used.

Answer 18

ARP

Question 19

Taking Turns schemes

Answer 19

Polling Multiple Access, Token Ring Multiple Access

Question 20

Bus Ethernet uses a random access scheme.

Answer 20

TRUE

Question 21

A “collision” is best described as…

Answer 21

when a node receives two or more frames at the same time.

Question 22

On the sending or receiving host, most of the protocol tasks “below” the application layer of the protocol stack (data encapsulation, IP addressing, etc. ) are handled by

Answer 22

the network interface controller (NIC)

Question 23

The method by which a MAC protocol coordinates access to a broadcast medium to prevent and/or reduce collisions is most commonly called ________

Answer 23

multiple access

Question 24

The data-link layer provides logical communications between [ Select ] and [ Select ] .

Answer 24

adjacent node, adjacent node

Question 25

Which are functions of the Ethernet preamble?

Answer 25

Clock synchronization
Start signal
Circuit wake-up

Question 26

A link-layer link between more than two adjacent nodes is called a/an [ Select ] link.

Answer 26

broadcast

Question 27

In Random Access multiple access schemes, no two nodes will ever transmit at the same time.

Answer 27

FALSE

Question 28

Which of the following are used in a wired Ethernet network?
Carrier Sense Multi-Access (CSMA)
Collision Detection (CD)
Exponential back-off/retry for collision resolution

Answer 28

TRUE

Question 29

In a CSMA/CD system, when a collision is detected, …

Answer 29

the sender will cut off transmission and wait some time before retransmitting.