Ethernet protocol basics in Computer Networks - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the sentence to identify the main function of Ethernet.

Computer Networks

Ethernet is a [1] protocol used to connect devices in a local area network.

Drag options to blanks, or click blank then click option'

Awired

Bfiber optic

Csatellite

Dwireless

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing Ethernet with Wi-Fi, which is wireless.

Ethernet is a wired protocol that connects devices using cables in a local area network (LAN).

2fill in blank

medium

Complete the sentence to name the unique identifier used by Ethernet devices.

Computer Networks

Each Ethernet device has a unique [1] address to identify it on the network.

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AIP

BDNS

CSSID

DMAC

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up MAC address with IP address.

The MAC address is a unique identifier assigned to each Ethernet device for network communication.

3fill in blank

hard

Fix the error in the description of Ethernet frame structure.

Computer Networks

An Ethernet frame starts with a [1] header that includes source and destination addresses.

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AIP

BTCP

CMAC

DHTTP

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing Ethernet frame header with IP or TCP headers.

The Ethernet frame header contains MAC addresses for source and destination, not IP or higher-level protocols.

4fill in blank

hard

Fill both blanks to describe the Ethernet frame's error checking method and its purpose.

Computer Networks

Ethernet frames use a [1] to detect errors and ensure data integrity during [2].

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ACRC

Bencryption

Ctransmission

Dcompression

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing error detection with encryption or compression.

Ethernet uses a CRC (Cyclic Redundancy Check) to detect errors during data transmission.

5fill in blank

hard

Fill all three blanks to complete the Ethernet frame comprehension code snippet.

Computer Networks

frame = { [1]: [2] for [3], [2] in ethernet_data.items() if [3] != 'preamble'}

Drag options to blanks, or click blank then click option'

Afield

Bvalue

Dheader

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'header' instead of 'field' for keys.

This code creates a dictionary of Ethernet frame fields and their values, excluding the preamble field.

Practice

1. What is the primary purpose of the Ethernet protocol in computer networks?

easy

A. To define how devices communicate over a local area network

B. To assign IP addresses to devices

C. To encrypt data sent over the internet

D. To manage wireless connections

Solution

1. Step 1: Understand Ethernet's role

   Ethernet is a protocol used mainly for communication within local area networks (LANs).

2. Step 2: Compare with other network functions

   Assigning IP addresses is done by DHCP, encryption by security protocols, and wireless management by Wi-Fi standards.

3. Final Answer:

   To define how devices communicate over a local area network -> Option A

4. Quick Check:

   Ethernet = LAN communication [OK]

Hint: Ethernet is about local network communication [OK]

Common Mistakes:

• Confusing Ethernet with IP address assignment
• Thinking Ethernet manages wireless connections
• Assuming Ethernet encrypts data

2. Which part of an Ethernet frame contains the unique hardware address of the sending device?

easy

A. Payload

B. Destination IP address

C. Frame Check Sequence

D. Source MAC address

Solution

1. Step 1: Identify frame components

   An Ethernet frame includes source and destination MAC addresses, payload, and error-checking fields.

2. Step 2: Locate the sender's hardware address

   The source MAC address field holds the unique hardware address of the sending device.

3. Final Answer:

   Source MAC address -> Option D

4. Quick Check:

   Sender's hardware = Source MAC address [OK]

Hint: Source MAC = sender's hardware address [OK]

Common Mistakes:

• Confusing payload with address fields
• Mixing IP address with MAC address
• Thinking Frame Check Sequence holds addresses

3. Consider this simplified Ethernet frame structure:
Destination MAC | Source MAC | Type | Payload | CRC
Which part is responsible for detecting errors in the frame?

medium

A. Type

B. Payload

C. CRC

D. Source MAC

Solution

1. Step 1: Understand frame fields

   The CRC (Cyclic Redundancy Check) field is used to detect errors in the frame data.

2. Step 2: Differentiate other fields

   Type indicates the protocol, Payload carries data, and Source MAC is the sender's address, none detect errors.

3. Final Answer:

   CRC -> Option C

4. Quick Check:

   Error detection = CRC [OK]

Hint: CRC checks for errors in Ethernet frames [OK]

Common Mistakes:

• Confusing Type field with error detection
• Assuming Payload includes error checking
• Mixing Source MAC with error detection

4. A network technician notices that Ethernet frames are being dropped due to collisions. Which Ethernet feature helps to reduce collisions in a shared network?

medium

A. MAC Address Filtering

B. Carrier Sense Multiple Access with Collision Detection (CSMA/CD)

C. IP Addressing

D. Encryption

Solution

1. Step 1: Identify collision handling method

   CSMA/CD is the Ethernet protocol feature that listens before sending and detects collisions to reduce frame loss.

2. Step 2: Eliminate unrelated options

   IP addressing manages network layer routing, MAC filtering controls access, and encryption secures data, none reduce collisions.

3. Final Answer:

   Carrier Sense Multiple Access with Collision Detection (CSMA/CD) -> Option B

4. Quick Check:

   Collision reduction = CSMA/CD [OK]

Hint: CSMA/CD manages collisions in Ethernet [OK]

Common Mistakes:

• Confusing IP addressing with collision control
• Thinking MAC filtering prevents collisions
• Assuming encryption affects collisions

5. You want to design a network where devices communicate using Ethernet frames but avoid collisions entirely. Which modern Ethernet technology should you choose?

hard

A. Full-duplex Ethernet with switches

B. Half-duplex Ethernet with hubs

C. Wireless Ethernet with CSMA/CA

D. Token Ring Ethernet

Solution

1. Step 1: Understand collision domains

   Half-duplex Ethernet with hubs shares the medium, causing collisions; full-duplex with switches separates devices.

2. Step 2: Evaluate options for collision avoidance

   Full-duplex Ethernet with switches allows simultaneous send/receive without collisions. Wireless uses CSMA/CA, not Ethernet. Token Ring is a different protocol.

3. Final Answer:

   Full-duplex Ethernet with switches -> Option A

4. Quick Check:

   No collisions = Full-duplex + switches [OK]

Hint: Switches + full-duplex avoid Ethernet collisions [OK]

Common Mistakes:

• Choosing hubs which cause collisions
• Confusing wireless CSMA/CA with Ethernet collision control
• Thinking Token Ring is Ethernet