Layer 3 (Network) (obj 1.1)

Question 1

Packet Switching

Answer 1

Data is divided into packets and then forwarded.

Question 2

Circuit Switching

Answer 2

Dedicated communication link is established between two devices.

Question 3

Message Switching

Answer 3

Data is divided into messages which may be stored and then forwarded.

Question 4

Route Discovery and Selection

Answer 4

Manually configured as a static route or dynamically through a routing protocol.

Question 5

Internet Control Message Protocol (ICMP)

Answer 5

Sends error messages and operational information to an IP destination.

Question 6

Connection Services

Answer 6

Augment Layer 2 connection services to improve reliablity.

Question 7

Network Layer

Answer 7

moves data around a network of networks (internetwork) using logical network and host id’s (

Question 8

What is the main appliance working at layer 3

Answer 8

Router

Question 9

Router

Answer 9

capable of forwarding packets around logical networks of different layer 1 and layer 2 types

Question 10

What type of data is used at Layer 3

Answer 10

Packets or datagrams

Question 11

Firewall

Answer 11

Software or hardware device that operates at layer 3 to filter network packets to an access control list (allows or blocks traffic)

Question 12

Access Control List

Answer 12

A network ACL is a list of the addresses and types of traffic that are permitted or blocked.

Question 13

IP (Internet Protocol) Address

Answer 13

In Layer 3, an IP (Internet Protocol) address is a logical address used to uniquely identify devices on a network.

These are logical addresses, and addressing schemes are set up to maximize the network topology and ensure secure and efficient data transfer.