# Quiz 1

## Question 1

Which field of an Ethernet frame provides receiver clock synchronization ?

1. Preamble
2. SFD
3. Type
4. FCS

## Question 2

How long is the physical address of a network device ?

1. 32 bytes
2. 32 bites
3. 48 bytes
4. 48 bits

## Question 3

What is the OUI of this MAC address ? **E8BA.7011.2874**

1. E8BA
2. E8BA.70
3. 7011
4. E8BA.7011

## Question 4

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

1. Preamble
2. Length
3. Source MAC address
4. Destination MAC address

## Question 5

What kind of frame does a switch flood out of all interfaces except the one it was received on ?

1. Unknown unicast
2. Known unicast
3. Allcast

## Solutions

### Question 1

* Preamble

### Question 2

* 48 bits

### Question 3

* E8BA.70

The OUI (Organizationally Unique Identifier) is the **first half (24 bits)** of a MAC address. It is a unique value assigned to the maker of the device.

### Question 4

* Source MAC address

### Question 5

* Unknown unicast


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