Lecture 3

Question 1

a set of rules that define a common language two computers use to exchange messages is called what?

Answer 1

Communication protocol

Question 2

What are the 7 layers of the OSI model?

Answer 2

Physical
Data link
network
transport
session
presentation
application

Question 3

____ occurs when a header or footer is added to the data of traffic flowing from the application layer down through to the physical layer.

Answer 3

Encapsulation

Question 4

The Protocol Data Unit at each of the PSI layers is called waht?

Answer 4

Physical- bit
Data link - frame
network - packet
transport- segment, datagram
Session, presentation, appliction - message, data, datastream

Question 5

A router functions at what layer of the OSI model?

Answer 5

Network Layer

Question 6

The TCPIP Model has 4 layers, what are they?

Answer 6

Network interface
Internet
Transport
Application

Question 7

The beacon frame in wireless access is used to do what?

Answer 7

Broadcast the SSID

Question 8

When multiple WAPs are used to connect a large area and systems to a wired infrastructure it is called what?

Answer 8

Enterprise extended mode infrastructure

Question 9

What are the 2 most secure methods of securing a wireless network?

Answer 9

802.1X authentication

WPA-2 authentication

Question 10

In a _____ topology, only 1 system can transmits at a time. If a segment within it is broken, all communication stop.

Answer 10

Ring

Question 11

A ____ topology is where several devices are connected to a central device.

Answer 11

Star

Question 12

When system are connected to each other with several links to provide redundancy it is called a _____.

Answer 12

Mesh topology

Question 13

A connection-oriented Transport layer protocol is called what?

Answer 13

TCP

Question 14

This network layer protocol is used to determine the health of a network.

Answer 14

ICMP

Question 15

Why is DNS used?

Answer 15

To resolve a name to an IP address.

Question 16

A perimeter network is also called what? What type of service is usually in the DMZ?

Answer 16

DMZ

Public access services, like web sites

Question 17

What type of firewall inspects headers for information on the source and destination of the traffic?
A) Application Level gateway firewall (proxy)
B) Static packet filtering firewall
C) Stateful inspection firewall

Answer 17

B) Static packet filtering firewall

Question 18

A ______ firewall is used to establish communication sessions between trusted partners. It is based solely on the endpoint designations of the communiction.

Answer 18

Circuit level gatewall (circuit proxy)

Question 19

This type of firewall filters traffic between content and context of the traffic.

Answer 19

stateful inspection