Networking Fundamentals Quiz

What is the purpose of routing in a network?

• Breaks application-layer messages into packets

• Determines the source-destination route taken by packets

• Moves packets from router's input to appropriate router output

• Allocates end-to-end resources for a call

How many layers are there in the OSI Reference Model?

• 4

• 5

• 6

• 7

What was one of the reasons why the OSI protocols did not become popular?

• The OSI protocols were too complex

• The competing TCP/IP protocols were already in widespread use

• The OSI protocols did not support connection-oriented communication

• The OSI protocols were not well implemented

What is the purpose of the Network News Transfer Protocol (NNTP)?

• Supporting connection-oriented communication

• Providing end-to-end transport service

• Fetching pages on the World Wide Web

• Moving USENET news articles around

What are the key design issues in the network layer?

• Accepting data from above and splitting it into smaller units

• Determining how packets are routed from source to destination, controlling packet congestion, providing quality of service, handling different addressing methods and protocols

• Transmitting raw bits over a communication channel

• Transforming a raw transmission facility into a line that appears free of undetected transmission errors

What is the Hyper Text Transport Protocol (HTTP) used for?

• Supporting connection-oriented communication

• Moving USENET news articles around

• Fetching pages on the World Wide Web

• Providing end-to-end transport service

What are regional networks used for?

• To connect access nets to global transit ISPs

• To connect access nets to ISPs

• To connect access nets to Internet exchange points

• To connect access nets to content provider networks

What is an Internet exchange point (IXP)?

• A point where ISPs connect to exchange routers

• A point where ISPs connect to exchange money

• A point where ISPs connect to exchange traffic

• A point where ISPs connect to exchange data centers

Given millions of access ISPs, how to connect them together?

• Connect each access ISP to a global transit ISP

• Connect each access ISP to a regional ISP

• Connect each access ISP to every other access ISP

• Connect each access ISP to a content provider network

What is the disadvantage of packet switching?

• Requires dedicated resources for each user

• Requires more complex protocols

• Excessive congestion can lead to packet delay and loss

• Does not provide circuit-like behavior