Chapter 7 - Ethernet

Question 1

What Makes up an Ethernet Frame?

Answer 1

• preamble
• destination/source addresses
• type
• data
• frame check sequence

Question 2

What Makes Up Frame Fields?

Answer 2

• frame start and stop flags
• addressing
• type
• control
• data
• error detection

Question 3

What Types of Messages Can Be Sent?

Answer 3

1. Unicast: sent to a single, specific device
2. Multicast: sent to a select few devices on a network
3. Broadcast: targets all devices on a specific subnet network

Question 4

What are the 2 Types of Forwarding?

Answer 4

• Flooding: all devices are sent the data, with only the correct one receiving it
• Forwarding: either store-and-forward or cut-through

Question 5

How Does MAC Address Buffering Occur?

Answer 5

1. Port-Based: frames stored in queues, can cause delayed transmission
2. Shared Memory: frames enter a common memory buffer, dynamic allocation, no delays

Question 6

What Does the Auto-MDIX Feature Do?

Answer 6

• Automatic Medium Dependent Interface Crossover
• when enabled, the switch detects the required cable type for copper Ethernet connections and configures the interfaces accordingly