Directly Connected Network

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What is a Directly Connected Network?

In networking, a directly connected network is a network that is immediately accessible through one of the router's interfaces, without the need to go through any other routers. This means:

  • The router has an interface configured with an IP address that belongs to that network, and

  • The router can communicate with devices in that network without routing through any other device.

How to Identify Directly Connected Networks (in your topology)

Let’s look at each router’s IP routing table and physical connections:

Router R1

This means:

  • R1 is directly connected to the 10.0.0.0/30 network via Serial0/0/0 (to R2).

  • R1 is also directly connected to the 192.168.1.0/24 network via Fa0/1 (to Switch 1 and PCs).

Router R2

This means:

R2 has three directly connected networks:

  • 10.0.0.0/30 via Serial0/0/0 (to R1)

  • 10.0.0.4/30 via Serial0/1/0 (to R3)

  • 192.168.2.0/24 via Fa0/1 (to Switch 2 and PCs)

Router R3

This means:

R3 is directly connected to:

  • 10.0.0.4/30 via Serial0/1/0 (to R2)

  • 192.168.3.0/24 via Fa0/1 (to Switch 3 and PCs)

Key Logical Takeaways

  1. Directly connected means the router has a leg (interface) in that network.

  2. If a router interface is configured with an IP address from a subnet, that entire subnet is considered directly connected.

  3. These routes appear automatically in the routing table with a "C" (Connected) label—no static or dynamic routing required.

  4. A router can only communicate with other networks (not directly connected) via routing (static/dynamic), not automatically.

Cisco Packet Tracer (Version 6.2.0.0052)

11KB
directly-connected-network.pkt
Open

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Keywords

Routing Table, Static Routing, Dynamic Routing, Default Route, Next Hop, Route Metric, Administrative Distance, Longest Prefix Match, Forwarding Information Base, Route Aggregation, Subnet Mask, Destination Network, Routing Protocols, Convergence, Hop Count, Path Selection, Route Redistribution, Route Advertisement, Control Plane, Data Plane, Nerd Cafe, نرد کافه

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