Computer Networking: A Top-Down Approach, Chapter 4 Questions with Detailed Verified Answers (100% Correct Answers) /Already Graded A+

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Computer Networking: A Top-Down Approach,
Chapter 4 Questions with Detailed Verified Answers
(100% Correct Answers) /Already Graded A+
Quiz: Network layer availability

Ans: In every host and router




Quiz: 2 key network-layer functions

Ans: forwarding and routing




Quiz: Forwarding

Ans: move packets from router's input to appropriate router's output




Quiz: Routing

Ans: determine route take by packets from source to destination




Quiz: Why use address ranges?

Ans: 4 billion IP addresses




Quiz: longest prefix matching

Ans: when looking for forwarding table entry for given destination address,

use longest address prefix that matching destination address




Sunday, 02 March 2025

,Quiz: 2 key router functions

Ans: run routing protocols, forward datagrams




Quiz: routing architecture

Ans: routing processor (compute forwarding tables, routing, management

control plane, done in software), high-speed switching fabric (forwarding

data plane, done in hardware)




Quiz: Input ports

Ans: line termination (physical layer); link layer protocol to receive; lookup,

forwarding, queueing




Quiz: decentralized switching

Ans: given datagram destination, lookup output port using forwarding table

in input port memory. Complete input port processing at line speed. Queuing

if datagrams arrive faster than forward rate into switch fabric




Quiz: switching fabric

Ans: transfer packet from input buffer to output buffer




Quiz: switching rate




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, Ans: rate at which packets are transfered from input to output, desirable at N

* line rate, with N inputs




Quiz: switching fabric types

Ans: memory, bus, crossbar




Quiz: switching via memory

Ans: switching under control of CPU, packet copied to main memory, speed

limited by memory bandwidth




Quiz: switching via bus

Ans: datagram moves via a shared bus, bus contention (speed limited by

bus bandwidth)




Quiz: switching via crossbar

Ans: overcome bus bandwidth, connect processors to multiprocessors,

parallel transmissions




Quiz: output ports

Ans: datagram buffer and queue, link layer protocol to send, line termination




Quiz: output port buffering


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