Q1: Write the difference between HUB and Switch.

 

Hub is a passive device that connects various computers to a single network and operates at the physical layer of the OSI model or Layer 2. Hub broadcasts data to all other ports regardless of whether it is destined for a specific destination.

 

Switch is an active device that connects multiple devices, manages ports and VLAN security settings and operates is the data link layer of the OSI model or Layer 3. A switch keeps a table of the addresses of the computers connected to it. When traffic passes through, the switch reads the address of the destination and routes it to the relevant computer rather than all connected computers. The traffic is routed to all connected computers if the destination address is not in the table.

 

Q2: Write the role of Network Bridge.

 

Bridge in computer network is a smart device that is used for creating one bigger network by connecting smaller subnetworks. Through a bridge, multiple LANs can be connected to form a larger and extended LAN. This function of creating a single aggregate network from multiple network segments is called network bridging. It works in the data link layer, which is the second network layer in the OSI model.

 

Q3: What is the functioning of Router?

 

A router is a device that connects two or more packet-switched networks or subnetworks. It serves two primary functions: managing traffic between these networks by forwarding data packets to their intended IP addresses and allowing multiple devices to use the same Internet connection.

 

Q4: Which device is used in network for Security?

 

Firewall is the device used in a computer network for security. Firewalls can come in hardware or software forms. Firewalls provide separation between your internal network and the wider Internet. They can block connections on specific ports, from specific IP addresses, and from machines or networks matching other criteria. Most firewalls are configured to deny incoming traffic by default, providing a baseline of security for your network.

 

Q5: Which device is used to regenerate the signal if signal loss is there?

 

A repeater is a network device used to regenerate a signal. Repeaters regenerate analog or digital signals that are distorted by transmission loss due to attenuation. A repeater does not make an intelligent decision concerning forwarding packets like a router or bridge.

 

Q6: What is the role of straight and cross cable?

 

Straight cable has identical ends and is used is to connect two devices of different types like connecting a computer toa router or a router to a switch.

 

Cross cable has different ends and is used to connect two devices of the same type like hub to another hub, or computer to another computer.