Lesson 11

Question 1

Firewall

Answer 1

A host-based or network-based device that filters inbound and outbound traffic. Firewalls use rules to define the filters.

Question 2

Perimeter network

Answer 2

An area between the Internet and an intranet hosting resources available to any Internet users.

Question 3

Proxy server

Answer 3

A server that acts as on behalf of private clients to retrieve web pages from the Internet. Proxy servers include NAT, can cache requests, filter requests, and check some of the retrieved web page’s content. A reverse proxy isolates web servers from direct access on the Internet by receiving requests from Internet clients and forwarding them to the web server.

Question 4

An organization wants to restrict which web pages employees can access on the Internet using company computers. What should be implemented?

Answer 4

Proxy server

Question 5

What is the basic function of a firewall?

Answer 5

To protect a network from unauthorized access

Question 6

What is the default security level for Local Intranet in Internet Explorer Security Zones?

Answer 6

Medium-low

Question 7

What allows computers to locate each other in a Microsoft network?

Answer 7

Network discovery

Question 8

Which network security zone represents the highest risk?

Answer 8

Internet

Question 9

How many firewalls are used to create a perimeter network? (Choose all that apply.)

Answer 9

One

Two

Question 10

True or false. A DMZ provides a layer of security for Internet-facing servers.

Answer 10

True

Question 11

Which of the following includes all external Web sites that are not listed in the Restricted or Trusted Sites zone?

Answer 11

Internet security zone

Question 12

Which of the following is used to separate an internal network from the internet?

Answer 12

Firewall

Question 13

John works as a Network Administrator for uCertify Inc. The employees of the company frequently use the Internet and make the company’s resources susceptible to attacks from unauthorized access. Which of the following will John use in order to protect the company’s network from unauthorized access?

Answer 13

Firewall

Question 14

Click on the area where you will find the options to edit the Inbound rule of a firewall.

Answer 14

System and Security

Question 15

A user Sam on the intranet is trying to access ucertify.com via the router. Choose and reorder the actions that Network Address Translation (NAT) will take to accomplish the task.

Answer 15

1. It receives the request and logs the source and destination IP address and port in an internal table.
2. It creates a new packet to forward the request to ucertify.com.
3. It changes the source IP address to its own public IP address and the source port to an unused port.
4. It sends the request to ucertify.com. ucertify.com returns the web page to the NAT server.
5. It looks at the source port and compares it to its internal NAT table and sends the page back to Sam’s computer.

Question 16

Name the proxy server functionalities whose descriptions are given in the following figure.

Answer 16

Caching
Content Checking
Filtering

Question 17

Which of the following is used to encrypt and authenticate packets?

Answer 17

IPSec

Question 18

Which of the following security zones is internal to the company, as well as closest to its internal network?

Answer 18

Intranet

Question 19

Identifying types of firewall

Answer 19

Proxy firewall: Examines the data and decides whether the requests should be forwarded or refused
Packet filter firewall: Blocks traffic to specific addresses, depending on the type of application
Stateful inspection firewall: Tracks the state of every network communication channel and records it in a state table

Question 20

Spot the extranet network

Answer 20

Private Connection or VPN on Internet image