Switching and bridging in Computer Networks - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the sentence to define a network switch.

Computer Networks

A network switch operates at the [1] layer of the OSI model.

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

ATransport

BNetwork

CPhysical

DData Link

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing the Network layer with the Data Link layer.

Thinking switches operate at the Physical layer.

A network switch works at the Data Link layer (Layer 2) to forward frames based on MAC addresses.

2fill in blank

medium

Complete the sentence to explain how a switch learns MAC addresses.

Computer Networks

A switch learns MAC addresses by [1] the source address of incoming frames.

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

Adeleting

Bbroadcasting

Crecording

Dignoring

Attempts:

3 left

💡 Hint

Common Mistakes

Thinking the switch ignores source addresses.

Confusing recording with broadcasting.

Switches record the source MAC address of incoming frames to build their MAC address table.

3fill in blank

hard

Fix the error in the sentence about bridging.

Computer Networks

A bridge connects two [1] networks to reduce traffic by filtering frames.

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

Adifferent

Bidentical

Cwireless

Dvirtual

Attempts:

3 left

💡 Hint

Common Mistakes

Thinking bridges connect identical networks without segmentation.

Confusing bridges with wireless access points.

A bridge connects two different networks or segments to reduce traffic by filtering frames between them.

4fill in blank

hard

Fill both blanks to complete the description of a switch's MAC address table.

Computer Networks

The MAC address table stores [1] addresses and their associated [2].

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

AMAC

BIP

Cports

Dprotocols

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing IP addresses with MAC addresses in the table.

Thinking the table stores protocols instead of ports.

The MAC address table stores MAC addresses and the ports where those addresses were last seen.

5fill in blank

hard

Fill all three blanks to complete the explanation of how a switch forwards frames.

Computer Networks

When a switch receives a frame, it checks the [1] address, looks up the [2] table, and forwards the frame to the correct [3].

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

Asource

BMAC

Cport

DIP

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing source and destination addresses.

Thinking switches use IP addresses to forward frames.

The switch checks the destination MAC address, looks up the MAC address table, and forwards the frame to the correct port.

Practice

1. What is the main purpose of a network switch in a local area network?

easy

A. To block all incoming traffic

B. To send data directly to the intended device

C. To assign IP addresses to devices

D. To connect different networks over the internet

Solution

1. Step 1: Understand the role of a switch

   A switch connects devices within the same network and forwards data only to the device it is meant for.

2. Step 2: Compare with other options

   Assigning IP addresses is done by a DHCP server, connecting different networks is done by routers, and blocking all traffic is not a switch's function.

3. Final Answer:

   To send data directly to the intended device -> Option B

4. Quick Check:

   Switch forwards data to correct device [OK]

Hint: Switch sends data only to the target device [OK]

Common Mistakes:

• Confusing switch with router
• Thinking switch assigns IP addresses
• Believing switch blocks all traffic

2. Which of the following is the correct function of a network bridge?

easy

A. To connect and filter traffic between two network segments

B. To assign IP addresses to devices

C. To provide wireless access to devices

D. To encrypt data packets

Solution

1. Step 1: Define the role of a bridge

   A bridge connects two or more network segments and controls the flow of data between them by filtering traffic.

2. Step 2: Eliminate incorrect options

   Assigning IP addresses is DHCP's job, wireless access is provided by access points, and encryption is done by security protocols, not bridges.

3. Final Answer:

   To connect and filter traffic between two network segments -> Option A

4. Quick Check:

   Bridge connects segments and filters traffic [OK]

Hint: Bridge links segments and filters data flow [OK]

Common Mistakes:

• Confusing bridge with DHCP server
• Thinking bridge provides wireless access
• Assuming bridge encrypts data

3. Consider a network with two segments connected by a bridge. If a device on segment A sends data to a device on segment B, what will the bridge do?

medium

A. It will forward the data only if the destination is on segment B

B. It will block the data to prevent traffic

C. It will broadcast the data to all devices on both segments

D. It will assign a new IP address to the data packet

Solution

1. Step 1: Understand bridge filtering

   The bridge learns which devices are on each segment and forwards data only to the segment where the destination device is located.

2. Step 2: Analyze options

   Blocking data prevents communication, broadcasting to all devices wastes bandwidth, and assigning IP addresses is not a bridge function.

3. Final Answer:

   It will forward the data only if the destination is on segment B -> Option A

4. Quick Check:

   Bridge forwards data only to correct segment [OK]

Hint: Bridge forwards data only to destination segment [OK]

Common Mistakes:

• Thinking bridge blocks all data
• Assuming bridge broadcasts to all devices
• Confusing bridge with DHCP server

4. A network administrator sets up a switch but notices that data is being sent to all devices instead of just the intended one. What is the most likely cause?

medium

A. The switch is assigning IP addresses incorrectly

B. The switch is blocking all traffic due to security settings

C. The switch is operating in hub mode or has a faulty MAC address table

D. The switch is connected to a wireless access point

Solution

1. Step 1: Identify switch behavior

   If a switch sends data to all devices, it behaves like a hub, often due to a missing or corrupted MAC address table.

2. Step 2: Rule out other causes

   Blocking all traffic would stop communication, IP assignment is unrelated to forwarding, and wireless access points do not cause this behavior.

3. Final Answer:

   The switch is operating in hub mode or has a faulty MAC address table -> Option C

4. Quick Check:

   Switch flooding due to MAC table issue [OK]

Hint: Switch flooding means MAC table problem or hub mode [OK]

Common Mistakes:

• Confusing IP assignment with forwarding issues
• Thinking wireless access point causes flooding
• Assuming security blocks cause flooding

5. In a large office, two separate departments have their own network segments connected by a bridge. The bridge is configured to filter traffic between them. Which of the following is a key benefit of this setup?

hard

A. It automatically assigns IP addresses to all devices in both departments

B. It allows all devices to receive every data packet for better communication

C. It encrypts all data passing between the two segments

D. It reduces unnecessary traffic between departments, improving network performance

Solution

1. Step 1: Understand bridge filtering benefits

   By filtering traffic, the bridge prevents unnecessary data from crossing between segments, reducing congestion and improving speed.

2. Step 2: Eliminate incorrect options

   Allowing all devices to receive all packets causes congestion, IP assignment is DHCP's role, and encryption is handled by security protocols, not bridges.

3. Final Answer:

   It reduces unnecessary traffic between departments, improving network performance -> Option D

4. Quick Check:

   Bridge filtering reduces traffic [OK]

Hint: Bridge filtering cuts traffic, boosts speed [OK]

Common Mistakes:

• Thinking bridge broadcasts all data
• Confusing bridge with DHCP server
• Assuming bridge encrypts data