export_week 8 summary exercises

Question 1

The process of moving a datagram from a router’s input port to output port is handled by the ________.

Answer 1

Switching fabric

Question 2

The Internet Protocol (IP) implements timing controls.

Answer 2

False

Question 3

What can cause packet queueing at a router’s output port? (Check all that apply)

Answer 3

• Slow outbound link transmission rate.

* Multiple data flows requiring the same outbound link

Question 4

Given a router with 5 input ports and 5 output ports. If the switching fabric is 5 times as fast as the input/output line speed, queueing _______ occur at an input port.

Answer 4

can

Question 5

The Internet Protocol (IP) header may be 28 bytes long.

Answer 5

True

Question 6

What is the longest-common-prefix for the following address range?

10011110 10111001 10011100 10000000 – 10011110 10111001 10011101 00000000

Answer 6

10011110101110011001110

10011110 10111001 1001110

Question 7

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

Answer 7

True

Question 8

In network graph terminology, [a] represent routers.

Answer 8

Nodes

Question 9

The largest amount of data, in bytes, which can be accomodated by a particilar network, link, or physical-layer is called the [a].

Answer 9

Maximum Transmission Unit (MTU)

Question 10

It is the responsibility of a routing algorithm to forward packets to the appropriate output link.

Answer 10

False

Question 11

In network graph terminology, [a] represent costs.

Answer 11

Weights

Question 12

The largest amount of data, in bytes, which can be accomodated throughout a datagram’s route from sender to receiver is called the [a].

Answer 12

Path Maximum Transmission Unit (Path MTU)

Question 13

IP datagrams fragments can not be fragmented again.

Answer 13

False

Question 14

The transport-layer header is encapsulated in every IP datagram fragment.

Answer 14

False

Question 15

The “traceroute” application (on Windows) sends UDP messages by default.

Answer 15

False

Question 16

The “traceroute” application (on Windows) receives ICMP messages.

Answer 16

True

Question 17

In network graph terminology, a [a] from A to B is the set of edges to traverse to reach B from A for the lowest total cost.

Answer 17

Shortest Path

Question 18

NAPT devices translate IP address and port numbers.

Answer 18

True

Question 19

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 19

False

Question 20

ICMP can carry messages from… (Check all that apply)

Answer 20

• Router to Sender Host
• Source Host to Destination Host
• Destination Host to Source Host
• Router to Router

Question 21

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? (Check all that apply)

Answer 21

• Source Port
• Source IP Address
• Header Checksum

Question 22

The “traceroute” application (on Windows) sends ICMP messages by default.

Answer 22

True

Question 23

It is the responsibility of a routing algorithm to determine the cost of an output link.

Answer 23

False

Question 24

The “time to live” field in a modern IPv4 datagram header specifies…

Answer 24

the number of remaining hops before the datagram is dropped.

Question 25

Given an internet represented as a weighted undirected graph, the shortest path between node X and node Y is the path that...

Answer 25

has the smallest sum of edge weights. 

Question 26

The IP header is encapsulated in IP datagram fragments.

Answer 26

False

Question 27

The network layer manages communications from ____ to _____.

Answer 27

* host | * host

Question 28

What can cause queueing at a router's input ports? (Check all that apply)

Answer 28

* Output port contention * Slow outbound link transmission rate * Head of Line blocking

Question 29

The process of determining a path through the internet is handled by the ________.

Answer 29

Routing algorithm

Question 30

A router's routing table is output by a ______.

Answer 30

Routing Algorithm

Question 31

In a datagram network, the responsibilities of the network layer include: (check all that apply).

Answer 31

* Packet forwarding * Packet Routing * Host-to-Host communication

Question 32

https://s3.amazonaws.com/classconnection/350/flashcards/1550350/jpg/capture-16240DA40793594CEBE.jpg

Answer 32

Port 1

Question 33

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)

Answer 33

* Header Checksum * Destination Port * Destination IP address

Question 34

The IP header is encapsulated in IP datagram fragments.

Answer 34

False

Question 35

The transport-layer header is encapsulated in every IP datagram fragment.

Answer 35

False

Question 36

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

Answer 36

False

Question 37

In network graph terminology, [a] represent direct connections between routers.

Answer 37

Edges

Question 38

In a fragmented IP datagram, the "offset" IP header field value is exactly equal to the number of bytes of fragmented data preceding this fragment.

Answer 38

False

Question 39

ICMP messages are carried within the payload of IP datagrams.

Answer 39

True

Question 40

If an IP datagram is fragmented into 1000-byte fragments, and later encounters a link with an 800-byte MTU, it is dropped.

Answer 40

False

Question 41

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

Answer 41

False

Question 42

The "Identification" header field is unchanged by IP datagram fragmentation.

Answer 42

True

Question 43

IP datagrams fragments can not be fragmented again.

Answer 43

False

Question 44

Network address translation alters IP to add new IP addresses.

Answer 44

False

Question 45

Network address translation is strictly a Layer-3 protocol.

Answer 45

False

Question 46

The "time to live" field in a modern IPv4 datagram header specifies...

Answer 46

The "time to live" field in a modern IPv4 datagram header specifies...

Question 47

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

Answer 47

True

Question 48

The "ping" application (on Windows) uses ICMP echo request/reply.

Answer 48

True

Question 49

The largest amount of data, in bytes, which can be accomodated throughout a datagram's route from sender to receiver is called the [a].

Answer 49

Path Maximum Transmission Unit (Path MTU)

Question 50

Network address translation has ameliorated the IP address shortage problem.

Answer 50

True

Question 51

Re-assembly of fragmented IP datagrams is handled by...

Answer 51

The Destination  Host

Question 52

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? (Check all that apply)

Answer 52

* Header checksum * Source IP Address * Source Port

Question 53

Select the proper equation for TCP's calculation of DevRTT.

Answer 53

DevRTTn = (1 - b) * DevRTTn-1 + b * (SampleRTTnew - EstimatedRTTn-1)

Question 54

When a destination host's IP fragment timer expires, it drops all accumulated fragments corresponding to that timer.

Answer 54

True

Question 55

The transport-layer header is encapsulated in the first fragmented IP datagram.

Answer 55

True

Question 56

The "traceroute" application (on Windows) receives ICMP messages.

Answer 56

False

Question 57

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

Answer 57

True