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Connecting Devices in Computer Networks

This quiz is for 4th-year students in the Electrical Engineering Department at Al-Mustansiryah University, covering Chapter 6 of Computer Networks. It focuses on the functions of network devices, including repeaters, hubs, bridges, routers, and switches.

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Questions and Answers

What is the primary function of a repeater in a LAN?

To extend the geographical range of a LAN

What layer of the OSI model do repeaters operate on?

Physical layer

What happens when two nodes on connected segments transmit at the same time in a repeater-based network?

A collision occurs

What type of topology is formed when using a hub?

<p>Logical bus, physical star</p> Signup and view all the answers

How does a hub handle incoming data from an adapter?

<p>It sends the data to all other adapters</p> Signup and view all the answers

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

<p>To filter or forward data between two networks</p> Signup and view all the answers

How many categories of connecting devices are mentioned in the chapter?

<p>5</p> Signup and view all the answers

What type of device acts on frames or packets?

<p>Router</p> Signup and view all the answers

What is the primary function of a bridge?

<p>To connect multiple LANs</p> Signup and view all the answers

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

<p>A switch connects multiple devices directly</p> Signup and view all the answers

What is the advantage of cut-through switching in switches?

<p>It reduces latency through the switch</p> Signup and view all the answers

What is the main function of a router?

<p>To connect LANs and WANs</p> Signup and view all the answers

What is the difference between a switch and a router?

<p>A router operates at the network layer</p> Signup and view all the answers

What is the disadvantage of cut-through switching?

<p>It may forward frames containing errors</p> Signup and view all the answers

What is the function of a router in terms of broadcast domains?

<p>It isolates broadcast domains</p> Signup and view all the answers

What do routers use to determine the best route?

<p>A routing algorithm</p> Signup and view all the answers

What is a key difference between a hub and a bridge?

<p>A hub does not perform filtering, while a bridge sends frames to all other interfaces.</p> Signup and view all the answers

What is the primary advantage of using a backbone hub?

<p>It extends the maximum distance between nodes.</p> Signup and view all the answers

What is a consequence of interconnecting multiple LAN segments with a hub?

<p>The individual segment collision domains become one large collision domain.</p> Signup and view all the answers

What is a characteristic of a bridge's operation?

<p>It performs filtering based on a table of MAC addresses.</p> Signup and view all the answers

What is a key difference between a collision domain and a broadcast domain?

<p>A collision domain is a part of the network where two or more nodes transmit at the same time, while a broadcast domain is a part of the network where NICs can 'see' other NICs' traffic.</p> Signup and view all the answers

How does a bridge divide a LAN?

<p>It segments a LAN into smaller LANs, each with its own collision domain.</p> Signup and view all the answers

What is a limitation of using a hub?

<p>It can't interconnect different Ethernet technologies because of no buffering at the hub.</p> Signup and view all the answers

What is the function of a bridge in a network?

<p>To divide a LAN into smaller segments, each with its own collision domain.</p> Signup and view all the answers

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Study Notes

Connecting Devices in Computer Networks

Functions of Network Devices

  • Separating (connecting) networks or expanding a network
  • Examples: Repeaters, Hubs, Bridges, Switches, Routers

Five Connecting Devices

  • Repeaters
  • Hubs
  • Bridges
  • Switches
  • Routers

Repeaters

  • A physical layer device that acts on bits, not on frames or packets
  • Regenerates incoming bits and transmits them onto all other interfaces
  • Used in LAN to connect cable segments and extend the maximum cable length
  • Does not implement any access method, so collisions can occur

Hubs

  • Acts on the physical layer, operating on bits rather than frames
  • Used to connect stations in a physical star topology, but logically a bus
  • Receives a bit from an adapter and sends it to all other adapters without filtering
  • Multiple Hubs can be used to extend the network length
  • Forms a single collision domain and a single broadcast domain

Bridges

  • Acts on the data link layer (MAC address level)
  • Used to divide (segment) a LAN into smaller LAN segments or to connect LANs with identical physical and data link layers protocol
  • Each LAN segment is a separate collision domain
  • Performs filtering using a table, unlike Hubs and Repeaters
  • Connects LANs, whereas Switches connect individual computers

Switches

  • Usually used to connect individual computers, not LANs like Bridges
  • Allows multiple devices connected to the switch to transmit simultaneously
  • Operates in Full-duplex mode, sending and receiving frames simultaneously
  • Performs MAC address recognition and frame forwarding in hardware
  • Types of Switches include:
    • Store-and-forward switching: receives entire frame before forwarding
    • Cut-through switching: forwards frames when enough is received to make a forwarding decision

Routers

  • Operates at the network layer, dealing with packets not frames
  • Connects LANs and WANs with similar or different protocols together
  • Isolates both collision domains and broadcast domains
  • Acts like normal stations on a network, but has multiple network addresses
  • Communicates with other Routers, exchanging routing information
  • Determines the best route using a routing algorithm and special software

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