Question: What Information Is Used To Forward Frames In A Layer 2 Switch?

What information does a switch use to forward Ethernet frames?

To forward the frame, the switch examines the destination MAC address and compares it to addresses found in the MAC address table.

If the address is in the table, the frame is forwarded out the port associated with the MAC address in the table..

How does a switch operate at Layer 2 in the OSI model?

An Ethernet switch operates at the data link layer (layer 2) of the OSI model to create a separate collision domain for each switch port. Each device connected to a switch port can transfer data to any of the other ports at any time and the transmissions will not interfere.

What will a switch do if the destination for a frame is not known?

If the destination MAC address is not in the table, the switch will forward the frame out all ports except the incoming port. This is known as an unknown unicast. If the destination MAC address is a broadcast or a multicast, the frame is also flooded out all ports except the incoming port.

What is the difference between Layer 2 and 3 switches?

A Layer 2 switch only works with MAC addresses and doesn’t interact with any higher layer addresses, such as an IP. A Layer 3 switch, on the other hand, can also do static routing and dynamic routing, which includes IP and virtual local area network (VLAN) communications.

What layer is a router?

Network LayerRouter. A router is a hardware device and has the function of routing packets between networks. A router works at Layer 3 of the OSI model – the Network Layer. This is the layer that the IP protocol works at.

What do Layer 2 switches use to decide where to forward a received frame?

What does a Layer 2 switch use to decide where to forward a received frame? Explanation: When a frame is received, the switch looks at the destination hardware address and finds the interface if it is in its MAC address table.

What are two methods for switching data between ports on a switch choose two?

Local Area Network (LAN) Switches support different Switching Methods. Important Switching Methods are store and forward, cut-through and fragment-free. Switching Methods determine how a switch receives, processes, and forwards a Layer 2 Ethernet frame.

Is a router a Layer 2 device?

Routing is a layer 3 function. Packet switching is a layer 2 function. If a router can packet switch as well as route, it is a layer 2 and layer 3 device. … Anything upper layer protocol is going to sit on software and hardware that also function at the lower levels, but routing is done at 3.

Which advantage does the store and forward switching method have compared with the cut through switching method?

The performance of store-and-forward switching is slower compared to cut-through switching performance. Collision detection is monitored by the sending device. Store-and-forward switching does not use IPv4 Layer 3 and 4 information for its forwarding decisions.

When would you configure VTP on a switch?

When would you configure VTP on a switch? When you have multiple switches with multiple VLANs and you want to share the VLAN database from one switch to all the others.

How do Ethernet switches know which ports to forward Unicast frames on?

To know which port is connected with which address, the switch uses the CAM table. … Switch forwards a known unicast frame only from the port which is directly connected to the destination address of that frame while it forwards an unknown unicast frame from all of its ports, except the port on which it arrived.

What is Layer 2 switch used for?

A layer 2 switch is a type of network switch or device that works on the data link layer (OSI Layer 2) and utilizes MAC Address to determine the path through where the frames are to be forwarded. It uses hardware based switching techniques to connect and transmit data in a local area network (LAN).

Is VLAN a Layer 2?

A virtual LAN (VLAN) is any broadcast domain that is partitioned and isolated in a computer network at the data link layer (OSI layer 2). LAN is the abbreviation for local area network and in this context virtual refers to a physical object recreated and altered by additional logic.

Does a Layer 2 switch have an IP address?

Explanation:A switch, as a Layer 2 device, does not need an IP address to transmit frames to attached devices. However, when a switch is accessed remotely through the network, it must have a Layer 3 address. … Routers, not switches, function as default gateways.

Can a Layer 2 switch route VLANs?

Layer 2 switches can only route packets between different subnets or VLANs if the two MAC addresses are both PHYSICALLY connected to the layer 2 switch and.

Which of the following does a router normally use when making a decision?

Which of the following does a router normally use when making a decision about routing TCP/IP packets? C (Destination IP address) . Routers compare the packet’s destination IP address to the router’s IP routing table, making a match and using the forwarding instructions in the matched route to forward the IP packet.