1. Internetworking Basics

Question 1

Define what an internetwork is.

Answer 1

Two or more networks joined together via a router configured with a logical network addressing scheme (e.g. IPV4, IPV6

Question 2

A simple network composed of a few devices and a hub contains …

Answer 2

One collision domain and one broadcast domain

Question 3

What is network segmentation?

Answer 3

The process of breaking up a larger network into smaller ones in order to reduce traffic congestion

Question 4

What does a switch break up?

Answer 4

Collision domains

Question 5

Name 6 things that commonly cause LAN traffic congestion

Answer 5

1. Too many hosts in a collision or broadcast domain
2. Broadcast storms
3. Too much multicast traffic
4. Low bandwidth
5. Adding hubs for connectivity to the network
6. A bunch of ARP broadcasts

Question 6

What is the default purpose of a router?

Answer 6

It breaks-up a broadcast domain into smaller broadcast domains

Question 7

How many network segments are contained in a network of two computers connected by a hub?

Answer 7

One

Question 8

How would you connect a LAN to a Wide Area Network?

Answer 8

Using a router that has a serial interface to the WAN.

Question 9

Name a typical physical interface type on a Cisco router.

Answer 9

v35

Question 10

Name two advantages of using routers in your network

Answer 10

1. They don’t forward broadcasts by default

2. They can filter network traffic based on layer 3 (Network layer) information such as an IP address.

Question 11

Name 4 networking related functions of a router

Answer 11

1. Packet switching
2. Packet filtering
3. Internetwork communication
4. Path selection

Question 12

A routing table is essentially what?

Answer 12

A map of the internetwork

Question 13

Switches create separate …

Answer 13

collision domains within a single broadcast domain.

Question 14

Routers provide …

Answer 14

a separate broadcast domain for each interface.

Question 15

What does a bridge do?

Answer 15

It allows you to connect a few devices (2-16) together. Each device has a separate collision domain between itself and the bridge. Hence, no collisions, but still one broadcast domain.

Question 16

You would use a bridge in a network to …

Answer 16

reduce the number of collisions by dividing a single collision domain into multiple collision domains whilst keeping all connected devices within the same broadcast domain.

Question 17

What do you increase when you use a bridge to connect devices to a network?

Answer 17

More bandwidth for users because you eliminate collisions between devices connected to the bridge.

Question 18

What do you create when you use hubs in an Ethernet network?

Answer 18

Network traffic congestion because you create a larger collision domain which increases the number of collisions.

Question 19

What would virtual LANs split up?

Answer 19

A broadcast domain

Question 20

What is a WLAN device?

Answer 20

A device that connects to a wireless network using a Network Interface Card (NIC)

Question 21

What do you use an Access Point (AP) for?

Answer 21

To connect wireless devices to a wired network

Question 22

What is a firewall?

Answer 22

A network security system that monitors and controls incoming and outgoing traffic based on security rules

Question 23

What does IPS mean?

Answer 23

Intrusion Prevention System

Question 24

What is a Cisco ASA firewall

Answer 24

Adaptive Security Appliance. Typically establishes a barrier between a trusted internal network and the Internet.