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What decisions do routers make as a packet enters an interface?
It determines which local IP on a given Router Table, be it DHCP or static, that packet is assigned to.
In an IPv4 environment what information is used by the router to forward data packets from one interface of a router to another?
It uses the MAC address, Media Access Control. Every packet sent from a computer contains its MAC address. The router stores this in its routing table. When it receives a packet with a destiation address of that MAC address, then it forwards it to that computer. This is called NAT, Network Address Translation. It uses the Destination IP address
What is the router interface that connects to a LAN called?
Outbound interface
Which part of an ip packet does the router use to make routing decisions?
the network portion of the destination ip address
What information do routers use to forward a message?
Entire chapters in the Cisco Networking Academy are dedicated to this topic. But basically, a router looks at the IP packet, and compares it to its routing table. The routing table says, for example, "Every packet for the destination network 10.0.5.0 /24 should be sent out of port Ethernet 2/1, next-hop address is 10.0.7.2". "/24" in this case means that the first 24 bits must match. The routing table itself is maintained manually (static routes), or updated through a routing protocol from neighboring routers.
What decisions do routers make as a packet enters an interface?
It determines which local IP on a given Router Table, be it DHCP or static, that packet is assigned to.
What steps are taken when forwadin an icmp packet?
For each router, the following steps occur: 1) The "access-group in" command is checked on the interface, and discards the packet if the rule tells it to do so. 2) The "TTL" field is decreased by 1. 3) If TTL is now 0, the router discards the packet and sends a reply packet back to the sender. 4) The packet's IP address is compared to the routing table to determine the next hop of the packet. 5) The router advises if the network or host is unreachable due to a down interface or no known route. 6) The router sends the packet to the outgoing interface's queue to be sent to the next hop. 7) The "access-group out" command is checked on the interface, and discards the packet if the rule tells it to do so. 8) The router sends the packet to the next hop.
When a router does not have an interface for the destination network it sends the traffic to where?
If a router has a route in its routing table, it will have a next hop IP address and / or outbound interface. If a router does not have a route in its routing table the packet will be dropped.
What portion of the IP packet does a router use to make forwarding decisions?
buffer
When forwarding a packet which route will the packet select?
First, routing is the process a router performs when making forwarding decisions for each packet arriving at the gateway interface. To forward a packet to a destination network, the router requires a route to that network. If a route to a destination network does not exist on the router, the packet will be forwarded to the default gateway. Now, the destination network can be a number of routers or hops away from the default gateway. If the router has an entry for the network in its routing table, it would only indicate the next-hop router to which the packet is to be forwarded to and not the exact route to the final router. To sum it up, the routing process uses a routing table to map the destination address to the next hop and then forwards the packet to the next-hop address.
As a packet enters an interface the router checks the x to see whether it is routable?
x -> routing table
When forwarding a route which route will router select?
First, routing is the process a router performs when making forwarding decisions for each packet arriving at the gateway interface. To forward a packet to a destination network, the router requires a route to that network. If a route to a destination network does not exist on the router, the packet will be forwarded to the default gateway. Now, the destination network can be a number of routers or hops away from the default gateway. If the router has an entry for the network in its routing table, it would only indicate the next-hop router to which the packet is to be forwarded to and not the exact route to the final router. To sum it up, the routing process uses a routing table to map the destination address to the next hop and then forwards the packet to the next-hop address.
What layer of OSI model does a router operate?
Router is a Layer 3 (Network Layer)device that checks packet's IP Address at input interface & routes them to interface connected to destination network if available.
Wic address is used by the router to direct a packet between networks?
The router only needs to know the next-hop address; in other words, it sends the data to the next router; this next router then takes its own decision.Each router maintains a routing table, with information about where to send IP packets. The information is stored on a per-network basis. When the router receives an IP packet, it consults the routing table, to see what is the next-hop address, and through which interface it must send the packet.The router only needs to know the next-hop address; in other words, it sends the data to the next router; this next router then takes its own decision.Each router maintains a routing table, with information about where to send IP packets. The information is stored on a per-network basis. When the router receives an IP packet, it consults the routing table, to see what is the next-hop address, and through which interface it must send the packet.The router only needs to know the next-hop address; in other words, it sends the data to the next router; this next router then takes its own decision.Each router maintains a routing table, with information about where to send IP packets. The information is stored on a per-network basis. When the router receives an IP packet, it consults the routing table, to see what is the next-hop address, and through which interface it must send the packet.The router only needs to know the next-hop address; in other words, it sends the data to the next router; this next router then takes its own decision.Each router maintains a routing table, with information about where to send IP packets. The information is stored on a per-network basis. When the router receives an IP packet, it consults the routing table, to see what is the next-hop address, and through which interface it must send the packet.
What are two switching functions of a router?
The router encapsulates the packet in the appropriate data link frame type for the outgoing data link. The router determines the exit interface after data encapsulation.
What is the term used for the passage of a packet through a router?
A hop.
Where is router configuration?
Configuring a physical router requires software like PUTTY. while configuring router on Software like packet tracer is done on CLI (i.e. command line interface).
