IDT6.4

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16 Terms

1
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Data Link Layer

controls how data is sent and received over the network.

2
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What is encapsulation in the context of the Data Link Layer?

the process of taking Layer 3 packets, such as IPv4 or IPv6, and adding Layer 2 frame headers for transmission.

3
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What are the sublayers of the Data Link Layer?

LLC sublayer and MAC sublayer.

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What does the MAC sublayer do?

controls the NIC and manages the sending/receiving of data on wired or wireless networks.

5
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What is a node?

A device that can receive, create, store, or forward data along a communication path.

Bv: computers, printers, routers, and switches.

6
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What types of transmissions occur at the Data Link Layer?

unicast, multicast, and broadcast.

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What is a MAC address?

physical address that uniquely identifies each device on a network.

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What is flow control in the Data Link Layer?

a technique that regulates data transmission between two stations at different speeds to prevent overwhelming the slower receiver.

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What are the two methods for flow control?

Stop-and-Wait and Sliding Window.

10
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What is an ARP request?

broadcast sent by a device to determine the MAC address associated with a specific IPv4 address when it's not available in its ARP table.

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What are the functions of ARP?

ARP's functions include resolving IPv4 addresses to MAC addresses and maintaining a table of IPv4 to MAC address mappings.

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What happens if a NIC receives a frame that does not match its MAC address?

If the NIC receives an Ethernet frame and the destination MAC address does not match its own, the device discards the frame.

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What is the purpose of the Start Frame of Preamble?

The Start Frame of Preamble is used for synchronization between sending and receiving devices, signaling them to prepare for a new frame.

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What is the role of the MAC-address table?

helps Ethernet switches determine how to forward traffic by mapping each port to a MAC address.

15
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Explain the function of error detecting codes in Data Link Layer communication.

Error detecting codes are additional data added to a digital message to identify if errors have occurred during transmission.

16
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What is Line Discipline in the Data Link Layer?

Line Discipline is the coordination method among device links determining which device can send data and when.