Computer Networks Chapter 6: Connecting Devices

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Questions and Answers

What is the primary function of a hub in a network?

To copy the received frame onto all other links

What is a major disadvantage of using hubs to interconnect LAN segments?

Reduced network performance due to increased collision domains

What is the main difference between a hub and a bridge?

A hub sends received frames to all other interfaces, while a bridge performs filtering

What is a broadcast domain?

The part of the network where each NIC can 'see' other NICs' traffic broadcast messages Signup and view all the answers

What is a collision domain?

The part of the network where two or more nodes transmit at the same time, causing collisions Signup and view all the answers

What is the advantage of using multiple hubs to extend the network length?

It extends the maximum distance between nodes Signup and view all the answers

What is the purpose of a bridge in a network?

To divide a LAN into smaller LAN segments Signup and view all the answers

What is a characteristic of a bridge in contrast to a hub?

It performs filtering and does not send received frames to all other interfaces Signup and view all the answers

What is the main function of a repeater in a network?

To regenerate and transmit bits onto all other interfaces Signup and view all the answers

What type of device operates on frames or packets?

Router Signup and view all the answers

What is the result of two nodes on connected segments transmitting at the same time in a network using repeaters?

Collision occurs Signup and view all the answers

What type of topology is used by a hub to connect stations?

Physical star Signup and view all the answers

What is the primary function of a bridge in a network?

To connect multiple networks Signup and view all the answers

Which of the following devices operates on the physical layer?

Repeater Signup and view all the answers

What is the main advantage of using repeaters in a LAN?

Extended geographical LAN range Signup and view all the answers

How do hubs handle incoming bits from an adapter?

They send it to all other adapters Signup and view all the answers

What is the primary function of a bridge in a network?

To connect individual computers to a LAN Signup and view all the answers

What is the main advantage of cut-through switching over store-and-forward switching?

It reduces the latency through the switch Signup and view all the answers

What is the primary function of a router in a network?

To forward packets between different networks Signup and view all the answers

What is the main difference between a switch and a bridge?

A switch connects multiple LANs, while a bridge connects individual computers Signup and view all the answers

What is the primary advantage of store-and-forward switching over cut-through switching?

It provides error-checking before forwarding the frame Signup and view all the answers

What is the main difference between a router and a switch?

A router isolates both collision and broadcast domains, while a switch does not Signup and view all the answers

What is the main purpose of routing algorithms in routers?

To determine the best route for packet forwarding Signup and view all the answers

What is the primary function of a switch in a network?

To allow multiple devices to transmit simultaneously Signup and view all the answers

Study Notes

Connecting Devices

Five types of connecting devices: Repeaters, Hubs, Bridges, Switches, and Routers
These devices separate or expand networks and operate at different layers of the OSI model

Repeaters

Operate at the Physical Layer
Act on bits, not frames or packets
Receive a bit, regenerate it, and transmit it onto all other interfaces
Used in LANs to connect cable segments and extend the maximum cable length
Do not implement any access method, so collisions can occur

Hubs

Operate at the Physical Layer
Act on bits, not frames
Receive a bit from an adapter and send it to all other adapters
Do not implement any access method or filtering
Form a single collision domain and broadcast domain
Can be used to extend the network length, but can reduce performance

Bridges

Operate at the Data Link Layer (MAC address level)
Used to divide a LAN into smaller segments or connect LANs with identical physical and data link layers protocol
Each LAN segment is a separate collision domain
Perform filtering using a table to make decisions
Do not send received frames to all other interfaces like hubs and repeaters

Switches

Operate at the Data Link Layer (MAC address level)
Used to connect individual computers, not LANs
Allow multiple devices to transmit simultaneously
Can operate in Full-duplex mode
Perform MAC address recognition and frame forwarding in hardware
Use different forwarding techniques, such as store-and-forward switching and cut-through switching

Routers

Operate at the Network Layer
Deal with packets, not frames
Connect LANs and WANs with similar or different protocols
Isolate both collision domains and broadcast domains
Act like normal stations on a network, but have multiple network addresses
Communicate with each other and exchange routing information
Determine the best route using routing algorithms and special software

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Computer Networks Chapter 6: Connecting Devices

Questions and Answers

What is the primary function of a hub in a network?

What is a major disadvantage of using hubs to interconnect LAN segments?

What is the main difference between a hub and a bridge?

What is a broadcast domain?

What is a collision domain?

What is the advantage of using multiple hubs to extend the network length?

What is the purpose of a bridge in a network?

What is a characteristic of a bridge in contrast to a hub?

What is the main function of a repeater in a network?

What type of device operates on frames or packets?

What is the result of two nodes on connected segments transmitting at the same time in a network using repeaters?

What type of topology is used by a hub to connect stations?

What is the primary function of a bridge in a network?

Which of the following devices operates on the physical layer?

What is the main advantage of using repeaters in a LAN?

How do hubs handle incoming bits from an adapter?

What is the primary function of a bridge in a network?

What is the main advantage of cut-through switching over store-and-forward switching?

What is the primary function of a router in a network?

What is the main difference between a switch and a bridge?

What is the primary advantage of store-and-forward switching over cut-through switching?

What is the main difference between a router and a switch?

What is the main purpose of routing algorithms in routers?

What is the primary function of a switch in a network?

Study Notes

Connecting Devices

Repeaters

Hubs

Bridges

Switches

Routers

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