ESAT Forouzan - Chapter 20: Network Layer Protocols (ARP, IPV4, ICMP, IPV6, and ICMPV6))

Question 1

_______ is a dynamic mapping protocol in which a physical address is found for a given IP address.
a. ARP
b. RARP
c. ICMP
d. None of the above

Answer 1

a. ARP

Question 2

A router reads the _______ address on a packet to determine the next hop.
a. MAC
b. Source
c. IP
d. ARP

Answer 2

c. IP

Question 3

The target hardware address on an Ethernet is _______ in an ARP request.
a. 0x000000000000
b. 0.0.0.0
c. Variable
d. Class-dependent

Answer 3

a. 0x000000000000

Question 4

An ARP reply is _______ to _______.
a. Broadcast; all hosts
b. Multicast; one host
c. Unicast; one host
d. Unicast; one host

Answer 4

c. Unicast; one host

Question 5

An ARP request is _______ to _______.
a. Broadcast; all hosts
b. Multicast; one host
c. Unicast; one host
d. Unicast; one host

Answer 5

a. Broadcast; all hosts

Question 6

What is the maximum size of the data portion of the IP datagram?
a. 65,535 bytes
b. 65,515 bytes
c. 65,475 bytes
d. 65,460 bytes

Answer 6

b. 65,515 bytes

Question 7

best-effort delivery service such as IP does not include _______.
a. Error checking
b. Error correction
c. Datagram acknowledgment
d. All the above

Answer 7

d. All the above

Question 8

An HLEN value of decimal 10 means _________.
a. There is 10 bytes of options
b. There is 40 bytes of options
c. There is 10 bytes in the header
d. There is 40 bytes in the header

Answer 8

d. There is 40 bytes in the header

Question 9

In IPv4, what is the value of the total length field in bytes if the header is 28 bytes and the data field is 400 bytes?
a. 428
b. 407
c. 107
d. 427

Answer 9

a. 428

Question 10

In IPv4, what is the length of the data field given an HLEN value of 12 and total length value of 40,000?
a. 39,998
b. 40,012
c. 40,048
d. 39,952

Answer 10

d. 39,952

Question 11

A datagram is fragmented into three smaller datagrams. Which of the following is true?
a. The do not fragment bit is set to 1 for all three datagrams.
b. The more fragment bit is set to 0 for all three datagrams.
c. The identification field is the same for all three datagrams.
d. The offset field is the same for all three datagrams

Answer 11

c. The identification field is the same for all three datagrams.

Question 12

If the fragment offset has a value of 100, it means that ______________.
a. The datagram has not been fragmented
b. The datagram is 100 bytes in size
c. The first byte of the datagram is byte 100
d. The first byte of the datagram is byte 800

Answer 12

d. The first byte of the datagram is byte 800

Question 13

What is needed to determine the number of the last byte of a fragment?
a. Identification number
b. Offset number
c. Total length
d. (b) and (c)

Answer 13

d. (b) and (c)

Question 14

The IP header size ___________.
a. Is 20 to 60 bytes long
b. Is 20 bytes long
c. Is 60 bytes long
d. Depends on the MTU

Answer 14

a. Is 20 to 60 bytes long

Question 15

If a host needs to synchronize its clock with another host, it sends a _______ message.
a. Time-stamp request
b. Source-quench
c. Routert-advertisement
d. Time-exceeded

Answer 15

a. Time-stamp request

Question 16

Which of the following types of ICMP messages needs to be encapsulated into an IP datagram?
a. Time-exceeded
b. Multicasting
c. Echo reply
d. All the above

Answer 16

d. All the above

Question 17

The purpose of echo request and echo reply is to ________________.
a. Report errors
b. Check node-to-node communication
c. Check packet lifetime
d. Find IP addresses

Answer 17

b. Check node-to-node communication

Question 18

In error reporting the encapsulated ICMP packet goes to _______.
a. The sender
b. The receiver
c. A router
d. Any of the above

Answer 18

a. The sender

Question 19

When the hop-count field reaches zero and the destination has not been reached, a _______ error message is sent.
a. Destination-unreachable
b. Time-exceeded
c. Parameter-problem
d. Redirection

Answer 19

b. Time-exceeded

Question 20

When not all fragments of a message have been received within the designated amount of time, a _______ error message is sent.
a. Source-quench
b. Time-exceeded
c. Parameter-problem
d. Time-stamp request

Answer 20

b. Time-exceeded

Question 21

Errors in the header or option fields of an IP datagram require a ______ error message
a. Parameter-problem
b. Source-quench
c. Router-solicitation
d. Redirection

Answer 21

a. Parameter-problem

Question 22

A ______ can learn about network ______ by sending out a router-solicitation packet.
a. Router; routers
b. Router; hosts
c. Host; hosts
d. Host; routers

Answer 22

d. Host; routers

Question 23

One method to alert a source host of congestion is the _______ message.
a. Redirection
b. Echo-request
c. Source-quench
d. Destination-unreachable

Answer 23

c. Source-quench

Question 24

A time-exceeded message is generated if _______.
a. The round-trip time between hosts is close to zero
b. The time-to-live field has a zero value
c. Fragments of a message do not arrive within a set time
d. (b) and (c)

Answer 24

d. (b) and (c)

Question 25

To determine whether a node is reachable, _____________ message can be sent.
a. An echo-reply
b. An echo-request
c. A redirection
d. A source-quench

Answer 25

b. An echo-request

Question 26

Which of the following is a necessary part of the IPv6 datagram?
a. Base header
b. Extension header
c. Data packet from the upper layer
d. (a) and (c)

Answer 26

d. (a) and (c)

Question 27

In IPv6, the _______ field in the base header restricts the lifetime of a datagram.
a. Version
b. Priority
c. Next-header
d. Hop limit
e. Neighbor-advertisement

Answer 27

d. Hop limit