Deck 1: Routing and Subnetting

Question 1

If a datagram router goes down then …………..

A)all packets will suffer
B)only those packets which are queued in the router at that time will suffer
C)only those packets which are not queued in the router at that time will suffer

Answer 1

only those packets which are queued in the router at that time will suffer

Question 2

In datagram subnet new route is chosen …………………

A)for every packet sent
B)for all the packet sent
C)only for the first packet

Answer 2

for every packet sent

Question 3

For a connection oriented service, we need a ……………

A)virtual circuit subnet
B)short circuit subnet
C)datagram subnet

Answer 3

datagram subnet

Question 4

In ………………, each packet of a message follows the same path from sender to receiver.

A)circuit switching
B)message switching
C)virtual approach to packet switching

Question 5

A permanent virtual circuit involves ……………..

A)connection establishment
B)data transfer
C)connection release

Question 6

The set of optimal routes from all sources to a given destination from a tree rooted to the destination is known as ……………..

A)binary tree
B)sparse tree
C)sink tree

Question 7

Adaptive routing algorithms get their information from ………….

A)only from local environment
B)only from adjacent routers
C)from locally, adjacent, external routers

Question 8

In Hierarchical routing for N router subnet, the optimal number of levels is …………..

A)log n
B)log(n -1)
C)ln n

Question 9

The router algorithm takes the decision to changes the route when ……………..

A)router changes
B)topology changes
C)user changes

Question 10

If route from router I to router J is computed on line based on the current statistics, then it is called as ………………..

A)dynamic routing
B)session routing
C)temporary routing

Question 11

If the subnet uses virtual circuits internally, routing decisions are made only when a new virtual circuit is being setup. This is called as……………..

A)session routing
B)circuit routing
C)datagram routing

Question 12

…………….. change their routing decisions to reflect changes in the topology.

A)nonadaptive algorithms
B)adaptive algorithms
C)static algorithms

Question 13

If router J is on the optimal path from router I to router K, then the optimal path from J to K also falls along the same route is known as ………………..

A)routing principle
B)optimality principle
C)sink tree principle

Question 14

……………. do not base their routing decisions on measurements or estimates of the current traffic and topology.

A)non adaptive algorithms
B)adaptive algorithms
C)static algorithms

Question 15

The method of network routing where every possible path between transmitting and receiving DTE is used is called ……………

A)random routing
B)packet flooding
C)directory routing

Question 16

In Hierarchical routing, the routers are divided into what is called as ……………..

A)zones
B)cells
C)regions

Question 17

The regions in Hierarchical routing are grouped in to ……………..

A)clusters
B)zones
C)blocks

Question 18

The Clusters in Hierarchical routing are grouped in to ………………

A)clusters
B)zones
C)blocks

Question 19

If a router sends every incoming packet out only on those lines that are going approximately in the right direction is known as ……………..

A)random flooding
B)static flooding
C)selective flooding

Question 20

To do multicast routing, each router computes a …………………

A)binary tree
B)avl tree
C)spanning tree

Question 21

In ………………. to send a multicast message a host sends it to the core, which then does the multicast along the spanning tree.

A)core based trees
B)avl trees
C)binary trees

Question 22

In distance vector routing algorithm, each router maintains a separate routing table with the following entries.

A)preferred input line , estimated time
B)preferred input line, estimated distance
C)preferred output line, estimated time

Question 23

In distance vector routing algorithm, the routing tables are updated …………………

A)by exchanging information with the neighbours
B)automatically
C)using the backup database

Question 24

In AODV routing algorithm for MANETs, the route is discovered at time

A)only when the network is established
B)in middle of the transmission
C)when there is a need for route by the host

Question 25

The processes that keep track of all mobile hosts visiting the area is ……………..

A)home agent
B)mobile agent
C)foreign agent