What is a network switch and how does it function?

1. Network Switches

Question:

What is a network switch and how does it function?

Description:

A network switch is a device that connects multiple devices within a local area network (LAN). It uses MAC addresses to forward data only to the intended recipient, improving network efficiency. Switches operate at Layer 2 (Data Link layer) of the OSI model and can manage multiple connections simultaneously.

2. VLAN (Virtual Local Area Network)

Question:

What is a VLAN and why is it used?

Description:

A VLAN is a logical grouping of devices on a network, regardless of their physical location. It allows network segmentation, improving security and reducing broadcast traffic. VLANs enable administrators to create distinct networks within the same physical infrastructure, enhancing management and performance.

3. Router Trunking

Question:

What is router trunking and how does it work?

Description:

Router trunking refers to the method of connecting multiple VLANs over a single physical link between switches and routers. Trunk ports carry traffic from multiple VLANs, using tagging protocols like IEEE 802.1Q to identify which VLAN each frame belongs to. This allows for efficient use of bandwidth while maintaining network segmentation.

4. EtherChannel

Question:

What is EtherChannel and what are its benefits?

Description:

EtherChannel is a technology that allows multiple physical Ethernet links to be combined into a single logical link. This increases bandwidth and provides redundancy. EtherChannel can improve network performance and reliability by aggregating multiple connections and ensuring that if one link fails, the others continue to carry traffic.

5. STP (Spanning Tree Protocol)

Question:

What is STP and why is it important in networking?

Description:

Spanning Tree Protocol (STP) is a network protocol that prevents loops in Ethernet networks. It creates a loop-free logical topology by blocking redundant paths and allowing only one active path between network devices. STP is crucial for maintaining stability and preventing broadcast storms in complex networks.

6. ACL (Access Control List)

Question:

What is an ACL and how is it used in networking?

Description:

An Access Control List (ACL) is a set of rules that determine what traffic is allowed or denied on a network. ACLs can be applied to routers and switches to control access to resources based on IP addresses, protocols, or ports. They enhance security by filtering traffic and restricting unauthorized access to network resources.