19 - TCP/IP Stack: Data Link Layer

Question 1

What does LAN stand for?

Answer 1

Local Area Network

Question 2

Describe the LAN

Answer 2

• Same network
• A function of the Link Layer

Question 3

What does WAN stand for?

Answer 3

Wide Area Network

Question 4

Describe the WAN

Answer 4

• Multiple networks that are connected
• A function of the Internet Layer

Question 5

What is a Hub?

Answer 5

Hubs provide the simplest means to connect hosts

• Operate at the Physical Layer
• Can be a problem because it could potentially violate the Confidentiality and Availability pillars of IA

Question 6

What is a Switch?

Answer 6

Like Hubs but “smarter”

• Forwards frames only to the host they’re (MAC) addressed to
• Operate at the Data Link Layer

Question 7

What is Ethernet Protocol?

Answer 7

Operates at the Data Link Layer and Physical Layer

• Does not guarantee a message will be successfully delivered
• Detect and correct signal interference

Question 8

What does MAC stand for and what is it?

Answer 8

Media Access Control

• Identifies your computer
• 48-bit numbers represented in hexadecimal

Question 9

What does ARP stand for?

Answer 9

Address Resolution Protocol

Question 10

What does ARP do?

Answer 10

Translates back and forth between data and network layers

• “Phone book” for MAC addresses on the local network
• Each host stores its own copy of an ARP Table