Networking

Question 1

Switches: Bridge traffic in hardware using an application called?

Answer 1

ASIC

Question 2

NAC 802.1X

Answer 2

This means you need to authenticate with a username and password before accessing a switch interface (port based). Either by using Extensible Auth Protocol or RADIUS.

Question 3

Looping prevention

Answer 3

802.1D to prevent loops. Spanning Tree Protocol

Question 4

Flood Guard

Answer 4

Flood the mac address table causing the table to overflow causing a DOS. If you incorporate a flood guard, that will give a maximum number of MAC addresses allowed on a particular interface.

Question 5

What are proxies useful for?

Answer 5

Cashing information, content scanning, access control and url filtering.

Question 6

Explicit proxy

Answer 6

You need to configure your OS or browser to use the proxy to be able to communicate to the internet.

Question 7

Transparent proxy

Answer 7

End users don’t know a proxy is in the middle. No configuration is needed in the OS.

Question 8

Application proxy

Answer 8

NAT. Some proxies know only HTTP. More advanced know HTTPS, FTP etc.

Question 9

Forward proxy

Answer 9

A proxy which is in the inside of our network to help users protect themselves from the internet, this is a forward proxy. Used internally.

Question 10

Reverse proxy

Answer 10

External, want to connect to internal. First need to connect to a proxy.

Question 11

Open proxy

Answer 11

Set up and configured by a 3rd party. User can go around URL filtering by using an open proxy which allows the user to see an illegal site. (Like at school when playing games were blocked). Open proxy makes the request to the site on your behalf. Downside: Owner of the open proxy could manipulate the url response from the site back to the proxy then add malicious code to send back to the user.