Network Layer

Question 21

Which of the following assertions is FALSE about the Internet Protocol (IP) ?

• It is possible for a computer to have multiple IP addresses
• IP packets from the same source to the same destination can take different routes in the network
• IP ensures that a packet is discarded if it is unable to reach its destination within a given number of hops
• The packet source cannot set the route of an outgoing packets; the route is determined only by the routing tables in the routers on the way

Question 22

Routers forward a packet using forwarding table entries. The network address of incoming packet may match multiple entries. How routers resolve this?

• Forward it the router whose entry matches with the longest prefix of incoming packet
• Forward the packet to all routers whose network addresses match.
• Discard the packet.
• Forward it the router whose entry matches with the longest suffix of incoming packet

Question 23

Consider the following routing table of a router.

Prefix	Next Hop
192.24.0.0/18	D
192.24.12.0/22	B

Consider the following three IP addresses.

Prefix
192.24.0.0/18
192.24.12.0/22
192.24.54.0

How are the packets with above three destination IP addresses are forwarded?

• 1->D, 2->B, 3->B

• 1->D, 2->B, 3->D

• 1->B, 2->D, 3->D

• 1->D, 2->D, 3->D

Question 24

Which one of the following fields of an IP header is NOT modified by a typical IP router?

• Checksum

• Source address

• Time to Live (TTL)

• Length

Question 25

In the network 200.10.11.144/27, the fourth octet (in decimal) of the last IP address of the network which can be assigned to a host is ________

• 158
• 255
• 222
• 223

Question 26

A subnet has been assigned a subnet mask of 255.255.255.192. What is the maximum number of hosts that can belong to this subnet?

• 14
• 30
• 62
• 126

Question 27

A host is connected to a Department network which is part of a University network. The University network, in turn, is part of the Internet. The largest network in which the Ethernet address of the host is unique is:  

• the subnet to which the host belongs
• the Department network
• the University network
• the Internet

Question 28

In TCP, a unique sequence number is assigned to each

• byte
• word
• segment
• message

Question 29

Which of the following objects can be used in expressions and scriplets in JSP (Java Server Pages) without explicitly declaring them?    

• session and request only

• request and response only

• response and session only

• session, request and response

Question 30

In the TCP/IP protocol suite, which one of the following is NOT part of the IP header?

• Fragment Offset
• Source IP address
• Destination IP address
• Destination port number