DCN_Unit4

You are designing a network router and need to choose a forwarding mechanism. The router must handle high-speed packet switching with minimum contention. Which switching fabric would you implement?

• Switching via memory

• Switching via a bus

• Switching via interconnection network

• Switching via application processor

A packet arrives at a router with destination address 11001000 00010111 00011000 10101010. Based on the following table, determine the outgoing interface using the longest prefix match.

• 0

• 1

• 2

• 3

A company with multiple departments wants to reduce IP address wastage and simplify routing. Which addressing strategy should be used?

• NAT

• Subnetting

• DHCP

• IP fragmentation

A router uses the Distance Vector Routing algorithm. Node X receives the following updates from its neighbors: What will be the updated ​Dx(Z)?

• 6

• 4

• 7

• 3

In Dijkstra’s algorithm, which node will be added next to the set of known nodes if the tentative distances are as follows?

• W

• V

• X

• Y

You are configuring a DHCP server in a network. A client sends a DHCP Discover message. What should be the next appropriate action by the server?

• Send DHCP ACK

• Assign a MAC address to the client

• Send DHCP Offer

• Send ICMP message to confirm request

Consider a router's output port where packets are arriving faster than the transmission rate. What consequence is most likely?

• Packets are sent back to the sender

• Output port queueing occurs, possibly leading to packet loss

• Packets are rerouted to another output port

• IP fragmentation is performed

A router receives an IP packet with a payload of 4000 bytes and the MTU of the outgoing link is 1500 bytes. What is the number of fragments created?

• 2

• 3

• 4

• 5

Which of the following best explains why poisoned reverse is used in distance vector routing?

• To reduce link costs

• To accelerate convergence of Dijkstra’s algorithm

• To enable IP fragmentation

• To handle routing loops by advertising a route as unreachable

You are implementing NAT in a home network. What does the NAT router modify in outgoing packets?

• Source MAC address

• Destination MAC address

• Source IP address and port number

• Destination IP address and TTL