CCNA 3 - Module 1This is a featured page


Vocabulary - Key Terms:
The following are important rules to remember:
  • A router must know in detail the subnet numbers attached to it.
  • A router does not need to inform other routers about each subnet if the router can send one aggregate route for a set of routes.
  • A router that uses aggregate routes has fewer entries in its routing table.

  • Static routes – The system administrator manually defines the static routes as the next hop to a destination. Static routes are useful for security and traffic reduction, as no other route is known.
  • Default routes – The system administrator also manually defines default routes as the path to take when there is no known route to the destination. Default routes keep routing tables shorter. When an entry for a destination network does not exist in a routing table, the packet is sent to the default network.
  • Dynamic routes – Dynamic routing means that the router learns of paths to destinations by receiving periodic updates from other routers.



Related Articles:
Rip


Key Concepts:
  • For Class A addresses, the default classful mask is 255.0.0.0.
  • For Class B addresses, the default classful mask is 255.255.0.0.
  • For Class C addresses, the default classful mask is 255.255.255.0.

Rip1 Vs. Rip2

RIP v1 has the following limitations:
  • It does not send subnet mask information in its updates.
  • It sends updates as broadcasts on 255.255.255.255.
  • It does not support authentication.
  • It is not able to support VLSM or classless interdomain routing (CIDR).

What Rip v2 and Rip v1 share
  • It is a distance vector protocol that uses a hop count metric.
  • It uses holddown timers to prevent routing loops – default is 180 seconds.
  • It uses split horizon to prevent routing loops.
  • It uses 16 hops as a metric for infinite distance.

Rip v2 Features
Course Materials:

CCNA 3 - Module 1 - Study Guide (.pdf)

Variable Length Subnet Masking (VLSM) Reading

Variable Length Subnet Masking Study Guide




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