CCNA Day 5 Ethernet LAN Switching (Part 1)

What is the only field in an Ethernet trailer?

FCS (Frame Check Sequence)

What are the 5 fields of an Ethernet header?

Preamble, SFD, Destination, Source, Type/Length

What does 'SFD' in an Ethernet header stand for?

Start Frame Delimiter

What does 'FCS' in an Ethernet frame stand for?

Frame Check Sequence

Ethernet header 'Preamble' = […] byte(s)

7

Ethernet header 'SFD' = […] byte(s)

1

Ethernet header 'Destination' = […] byte(s)

6

Ethernet header 'Source' = […] byte(s)

6

Ethernet header 'Type/Length' = […] byte(s)

2

Ethernet trailer 'FCS' = […] byte(s)

4

Which field of an Ethernet header is used for synchronization?

Preamble

What is the bit pattern of one byte in the Ethernet preamble?

10101010

What is the bit pattern of the Ethernet SFD?

10101011

Which field of an Ethernet header marks the end of the preamble?

SFD

What does MAC stand for?

Media Access Control

How long is a MAC address? = […] bytes

6

How long is a MAC address? = […] bits

48

A value of […] or less in the Type/Length field indicates Length.

1500

A value of […] or greater in the Type/Length field indicates Type.

1536

What is the Ethernet Type value for IPv4? (in hexadecimal)

0x0800

What is the Ethernet Type value for IPv6? (in hexadecimal)

0x86DD

What kind of algorithm does the Ethernet FCS use?

CRC (Cyclic Redundancy Check)

What is another name for a MAC address?

BIA (Burned-In Address)

The first […] bytes of a MAC address are the OUI.

3

The first 3 bytes of a MAC address are the […]

OUI (Organizationally Unique Identifier)

A MAC address is written as […] hexadecimal characters.

12

Hexadecimal A = Decimal […]

10

Hexadecimal B = Decimal […]

11

Hexadecimal C = Decimal […]

12

Hexadecimal D = Decimal […]

13

Hexadecimal E = Decimal […]

14

Hexadecimal F = Decimal […]

15

A […] frame is a frame destined for a single target.

unicast

A MAC address learned by a switch without manual configuration is called a …

Dynamic MAC address (Dynamically learned MAC address)

What does a switch do with an unknown unicast frame?

Floods it out all ports (except the one it was received on)

A switch will flood an […] unicast frame.

unknown

By default, a dynamic MAC address will be removed from the MAC address table after [time] of inactivity.

5 minutes

Which field of an Ethernet frame does a switch use to learn and populate its MAC address table?

Source MAC Address