You are the network administrator for your company. The Chief Technical Officer of the company is looking for a routing solution that satisfies the following
– No routing protocol advertisements
– Increased network security
– No routing protocol overhead
– Not concerned about fault tolerance
Which of the following routing techniques matches the criteria?
A. Dynamic routing
B. Hybrid routing
C. Static routing
D. Public routing
Correct Answer: C
The static routing technique matches the criteria given in this scenario. Static routing is a process of manually entering routes into a routing table. Static routes are not recommended for large networks because static routes are manually configured on the router. However, if a single link is used to connect an enterprise to an Internet Service Provider (ISP), then static routing is the best option.
The following are characteristics of static routing:
– Configuring static routes does not create any network traffic.
– Manually configured static routes do not generate routing updates and therefore do not consume any network bandwidth.
– Router resources are used more efficiently.
– Static routes are not recommended for large networks because they are manually configured on the router and maintaining the routes can become problematic.
– Static route configuration is not fault tolerant, because static routes do not automatically adapt to changes in the network.
The dynamic routing option is incorrect because route updates consume bandwidth and overhead. While the scenario is not concerned with routing protocol overhead, it states that there should be no bandwidth consumption by route advertisements.
Hybrid routing and public routing are not valid routing techniques in Cisco terminology.
Which two are advantages of static routing when compared to dynamic routing? (Choose two.)
A. Configuration complexity decreases as network size increases. B. Security increases because only the network administrator may change the routing table. C. Route summarization is computed automatically by the router. D. Routing tables adapt automatically to topology changes. E. An efficient algorithm is used to build routing tables, using automatic updates. F. Routing updates are automatically sent to neighbors. G. Routing traffic load is reduced when used in stub network links.
Correct Answer: B, G
Since static routing is a manual process, it can be argued that it is more secure (and more prone to human errors) since the network administrator will need to make changes to the routing table directly. Also, in stub networks where there is only a single uplink connection, the load is reduced as stub routers just need a single static default route, instead of many routes that all have the same next hop IP address.