Can router forward frames?

Yes. A router must strip off the layer-2 frame in order to get to the layer-3 packet. The router then routes the packet to the next interface toward the destination, based on the layer-3 destination address.

What happens when Ethernet frame arrives at NIC?

When an Ethernet frame arrives at a network interface card, the interface cards assembles the frame, writes the frame into a memory location, and issues a signal to the Linux operating system. Then, the device driver for the appropriate network interface reads and demultiplexes the frame.

What address does Ethernet use to forward frames?

MAC address
Frame Forwarding (1.2. 1) On Ethernet networks, frames contain a source MAC address and a destination MAC address. Switches receive a frame from the source device and quickly forward it toward the destination device.

What is raw Ethernet frame?

In computer networking, an Ethernet frame is a data link layer protocol data unit and uses the underlying Ethernet physical layer transport mechanisms. The frame ends with a frame check sequence (FCS), which is a 32-bit cyclic redundancy check used to detect any in-transit corruption of data.

What happens immediately after an Ethernet switch receives an Ethernet frame?

When the switch receives the frame, it immediately forwards that frame to Port 4.

Can Ethernet frames travel through a router?

Yes and no. At the data-link layer (Ethernet in this case), there is no concept of an “IP address”: the only address that exists is the MAC address. Frames that are sent can be marked as containing IP packets (EtherType 0x0800/0x86DD), but it’s up to higher-level layers to decide what to do with the data.

Are Ethernet messages packets or frames?

A frame is the chunk of data sent as a unit over the data link (Ethernet, ATM). A packet is the chunk of data sent as a unit over the layer above it (IP). If the data link is made specifically for IP, as Ethernet and WiFi are, these will be the same size and packets will correspond to frames.

Is a frame the same as a packet?

The main difference between a packet and a frame is the association with the OSI layers. While a packet is the unit of data used in the network layer, a frame is the unit of data used in the OSI model’s data link layer. A frame contains more information about the transmitted message than a packet.

What is the difference between packet and frame?

Do switches have a MAC address?

Switches are unlike hubs or repeaters. Switches usually have a bunch of MAC addresses reserved in its MAC address table. When forwarding a frame, the switch first looks up the MAC address table by the destination MAC address of the frame for the outgoing port.

What is an Ethernet frame?

When your computer communicates with another device on your network, the data being transmitted receives an Ethernet header and an Ethernet trailer. When a header and a trailer are attached to data to be sent across a network, this creates an Ethernet frame.

How does the host node prepare the Ethernet frame?

The reader needs to be reminded that the Ethernet protocol on the host node needs the MAC address of the destination node to prepare the Ethernet frame. The host node has a routing table with IP addresses mapped to Ethernet addresses, known as ARP cache.

What is the destination address in the Ethernet frame?

The destination address in the Ethernet frame is all 1s, indicating that it is a broadcast address. Fig. e73.7 illustrates the ARP packet format. Each field is described as follows: Sign in to download full-size image

Is a unique source address required when using an Ethernet switch?

A unique Ethernet source address is required when using a switch. However, the unique source address is not required without a switch. In this case, the data packet can be transferred through the broadcast or the point-to-point connection. Frame data is an Ethernet PDU and is the data area of the Ethernet frame.