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Computer Networks Lecture 10: Introduction to Data Link Layer

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Computer Networks Lecture 10: Introduction to Data Link Layer

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Questions and Answers

What is the primary responsibility of the data link layer?

Assembling and disassembling frames

Converting data into electrical signals

Transferring datagrams from one node to the physically adjacent node over a link (correct)

Routing datagrams between different networks

Which hardware devices can implement the data link layer?

Ethernet card and 802.11 card (correct)

Servers and workstations

Modems and gateways

Routers and switches

What does the data link layer do with the packets received from the network layer?

Transmits them wirelessly

Encapsulates them into frames (correct)

Routes them to the correct destination

Converts them into electrical signals

Where is the data link layer deployed?

In all network nodes Signup and view all the answers

What is the main role of the data link layer protocol?

Framing Signup and view all the answers

How does the data link layer transfer frames on the hardware?

Bit-by-bit transmission Signup and view all the answers

What is the responsibility of the Logical Link Control (LLC) sublayer in the data link layer?

Dealing with framing and detecting errors Signup and view all the answers

Which error detection mechanism is the least expensive and appends a redundant parity bit to every data unit?

Simple Parity Checking Signup and view all the answers

What type of error means that two or more bits in the data unit have changed from 0 to 1 or vice-versa?

Burst Error Signup and view all the answers

Which sublayer of the data link layer is responsible for hardware addressing mechanisms and controls physical media access?

Media Access Control (MAC) Signup and view all the answers

In the context of error detection, what is one-dimension parity check meant to achieve?

Detecting single-bit errors Signup and view all the answers

What protocol is used for wireless links at the data link layer?

802.11 Signup and view all the answers

What are the two types of errors discussed in the text related to data units?

Single-bit Error and Burst Error Signup and view all the answers

What is the main function of the Media Access Control (MAC) sublayer in the data link layer?

Managing hardware addressing mechanisms Signup and view all the answers

'Parity check bits are calculated for each row, which is equivalent to a simple parity check bit.' - This statement is related to which error detection mechanism?

Two-dimensions Parity Check Signup and view all the answers

What does the Cyclic Redundancy Check (CRC) provide in addition to error detection?

Error detection and correction Signup and view all the answers