Table of Contents
- 1 What happens when a router receives a frame?
- 2 What does a router do when it receives an IP packet?
- 3 Do routers forward frames or packets?
- 4 What does a router do after it receives a datagram containing a destination address that is not listed in the routing table?
- 5 What is a frame packet?
- 6 Whats the difference between a frame and a packet?
- 7 How does a router decide which interface to use?
- 8 How does the routing table work in a router?
- 9 What happens when the interface associated with a static route goes down?
What happens when a router receives a frame?
When a router receives a frame, it does strip off the frame to get to the packet. The router then looks in its routing table to see if it has a route to the destination address. If not, it drops the packet.
What does a router do when it receives an IP packet?
When a router receives a packet, the router checks its routing table to determine if the table lists the destination address in the header. If the table does not contain the destination address, the router forwards the packet to another router that is listed in its routing table.
Do routers forward frames or packets?
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.
How does the packet is forwarded in router?
Most packets are forwarded based on the packet’s IP destination address, along with routing information held within the router in a routing table. A router does not by default forward a packet with an IP broadcast address. Protocols using broadcast packets normally only operate within a single broadcast domain.
When a packet arrives at a router?
A Router is a networking device that forwards data packets between computer network. This device is usually connected to two or more different networks. When a data packet comes to a router port, the router reads address information in packet to determine out which port the packet will be sent.
What does a router do after it receives a datagram containing a destination address that is not listed in the routing table?
If the table does not contain the destination address, the router forwards the packet to another router that is listed in its routing table. Refer to Configurationing an IPv4 Router for detailed information on routers. The following figure shows a network topology with three networks that are connected by two routers.
What is a frame packet?
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.
Whats the difference between a frame and 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 IP packet forwarding?
Packet Forwarding is the process of a networking component accepting a packet and transmitting it to its destination. For example, a router receives packets from hosts on one attached network and forwards them to hosts on another attached network or to another router for further forwarding. Packet Forwarding.
What does the router do when it receives a packet?
Explanation: When a router receives a packet, it examines the destination address of the packet and uses the routing table to search for the best path to that network. 10. Which field in an IPv6 packet is used by the router to determine if a packet has expired and should be dropped?
How does a router decide which interface to use?
Routers examine the destination IP address of a received packet and make routing decisions accordingly. To determine out which interface the packet will be sent, routers use routing tables. A routing table lists all networks for which routes are known. Each router’s routing table is unique and stored in the RAM of the device.
How does the routing table work in a router?
When a router receives a packet that needs to be forwarded to a host on another network, it examines its destination IP address and looks for the routing information stored in the routing table. Each entry in the routing table consists of the following entries:
What happens when the interface associated with a static route goes down?
The router polls neighbors for a replacement route. The router automatically redirects the static route to use another interface. The static route remains in the table because it was defined as static. Explanation: When the interface associated with a static route goes down, the router will remove the route because it is no longer valid.