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Questions and Answers
Explain the process a router follows when receiving a packet from a host and searching for a matching destination network entry in the routing table.
Explain the process a router follows when receiving a packet from a host and searching for a matching destination network entry in the routing table.
The router decapsulates the packet, searches the routing table for a matching destination network entry, uses the static route if available, applies the default static route if configured, drops the packet and sends an ICMP message back if no match is found, and encapsulates the packet and forwards it out of the appropriate interface if a routing table entry is matched.
What does a router do if the destination IP address does not match a specific route to the destination network?
What does a router do if the destination IP address does not match a specific route to the destination network?
The router will use the default static route (if configured) to identify the next hop IP address or exit interface.
What action does a router take if the destination IP address does not match a route table entry?
What action does a router take if the destination IP address does not match a route table entry?
The router will drop the packet and send an ICMP message back to the source.
Describe the process a router follows when the packet reaches the destination network and the destination IP address matches a directly connected Ethernet interface.
Describe the process a router follows when the packet reaches the destination network and the destination IP address matches a directly connected Ethernet interface.
Flashcards
Router's Packet Handling
Router's Packet Handling
Router decapsulates, searches routing table, uses static route if available, applies default static route if configured. If no match, the packet is dropped and an ICMP message is sent back. If a match is found, the packet is encapsulated and forwarded.
No Specific Route Match
No Specific Route Match
If the destination IP address doesn't match a specific route, the router uses the default static route (if configured) to identify the next hop IP address or exit interface.
No Route Table Entry Found
No Route Table Entry Found
If a router can't match the destination IP address to any route table entry, it will drop the packet and send an ICMP message back to the source.
Packet Reaches Destination Network
Packet Reaches Destination Network
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Study Notes
Router Packet Processing
- A router receives a packet from a host and checks the destination IP address against the routing table entries.
- The router searches for a matching destination network entry in the routing table.
Handling Unknown Destinations
- If the destination IP address does not match a specific route to the destination network, the router checks for a default route (or gateway of last resort).
- If a default route is configured, the router forwards the packet to the default route.
- If no default route is configured, the router discards the packet and sends an ICMP Destination Unreachable message to the source IP address.
Packet Delivery
- When the packet reaches the destination network, the router checks if the destination IP address matches a directly connected Ethernet interface.
- If a match is found, the router forwards the packet to the directly connected Ethernet interface for delivery to the destination host.
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