HOMEWORK ASSIGNMENT

Week 4

30 Points Maximum

Name ______________________________________

NETW204

Homework #4

Due Date ______5/31/15_______________________________

Professor ______Gary Giomi________________________________ 

Static and Dynamic Routing

1. A network engineer is troubleshooting a small LAN network with one border router, GW01 that connects to the Internet Service Provider’s (ISP) network. GW01 uses its Serial 0/2/1 interface to connect to the ISP’s router. Everyone on the LAN network lost connectivity to the Internet. Upon troubleshooting the issue, the network engineer notices the following message after typing show ip route.

Gateway of last resort required but not set.

What do you suggest the network engineer do to rectify this issue? Assume the problem is only on the organization’s LAN side of the network. Provide as much information as possible including specific commands and all required parameters. (10 points)

What I would do first is to figure out what the configuration is trying to say. Type in the ip-route, ip-default network configurations to see what or where the traffic is going. The ip default-network command takes precedence and is chosen for the gateway of the last stop. In the case of multiple ip routes 0.0.0.0 0.0.0.0 commands are used to configure a default route the traffic is load/balanced over many other routes.

2. A Cisco router has learned the following destination prefix 209.175.28.0 /24 from its directly connected network, static routing, and via dynamic routing. List in order of importance the way the router will go about inserting the route in its final routing table assuming everything is now working. What is the Cisco router using to make that decision? Explain when the dynamic routing protocol information will be utilized in the routing table. (10 points)

Various routing processes, actually run a routing protocol, called the Enhanced Interior

Gateway Routing Protocol, Border Gateway Protocol, followed by the Intermediate System to Intermediate System, and Open Shortest Path First. The routing table accepts information from the routing processes and also replies to requests for information from the forwarding process. The forwarding process, basically requests the information from the routing table to make a packet forwarding decision.

3. The show ip interface brief command executed on router1 R1 and R2 generated the following output. What would be the static route commands that you would type on R2 in order to reach R1’s subnets. Provide complete configuration command with destination prefixes and next-hop information or exit interface. Assume R1 is already configured. (10 points)

You would start with looking up the ip destination in the routing table as well as the transmission of the data to a next hop router or to the final destination. This is known as ip forwarding or in some cases just forwarding. The next process is when path calculation determines the content of the routing table. Static routing is manually configuring. IP address of next hop router is the command you would put.

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