ITN Unit 7

What are the two sub-layers of the Data Link Layer?

• Session

• Logical Link Control

• Transport

• Media Access Control

• Application

Which two functions are performed at the LLC sublayer of the OSI Data Link Layer to facilitate Ethernet communication? (Choose two.)

• implements CSMA/CD over legacy shared half-duplex media

• enables IPv4 and IPv6 to utilize the same physical medium

• integrates Layer 2 flows between 10 Gigabit Ethernet over fiber and 1 Gigabit Ethernet over copper

• implements a process to delimit fields within an Ethernet 2 frame

• places information in the Ethernet frame that identifies which network layer protocol is being encapsulated by the frame

Which two functions are performed at the MAC sublayer of the OSI Data Link Layer to facilitate Ethernet communication? (Choose two.)

• handles communication between upper layer networking software and Ethernet NIC hardware

• implements trailer with frame check sequence for error detection

• places information in the Ethernet frame that identifies which network layer protocol is being encapsulated by the frame

• implements a process to delimit fields within an Ethernet 2 frame

• adds Ethernet control information to network protocol data

Answer explanation

The general format for IPv6 global unicast addresses includes a global routing prefix, a subnet ID, and an interface ID. The global routing prefix is the network portion of the address. A typical global routing prefix is /48 assigned by the Internet provider. The subnet ID portion can be used by an organization to create multiple subnetwork numbers. The interface ID is similar to the host portion of an IPv4 address.

What is the minimum ethernet frame size?

• 1bit

• 64 bytes

• 1518 bytes

• 64 bits

• 1518 bits

Answer explanation

Any frame less than 64 bytes in length is considered a “collision fragment” or “runt frame” and is automatically discarded

What is the maximum ethernet frame size?

• 1bit

• 64 bytes

• 1518 bytes

• 64 bits

• 1518 bits

Answer explanation

Frames with more than 1500 bytes of data are considered “jumbo” or “baby giant frames”.

How big is a MAC address?

• 4 bits

• 48 bits

• 48 bytes

• 16 bytes

The first half of a MAC address is a unique value that has been assigned to the manufacturer of the NIC, what is it called?

• IEEE

• OUI

• VA

• MAC

Answer explanation

An Ethernet MAC address consists of a 6 hexadecimal vendor OUI code followed by a 6 hexadecimal vendor-assigned value

Which of the options is a MAC Broadcast address?

• FE80::/10

• 01:00:5E:00:00:00

• FF:FF:FF:FF:FF:FF

• 33:33:33:33:33:33

Which of the options is a MAC Multicast address?

• FE80::/10

• 01:00:5E:00:00:00

• FF:FF:FF:FF:FF:FF

• 33:33:33:33:33:33

Of the different types of frame forwarding, which receives the whole frame before sending it onwards?

• Cut-Through

• Store-and-Forward

• Fast-Forward

• Fragment Free