Cisco Router Dynamic Routing Protocols

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Questions and Answers

What is a stub network characterized by?

Having multiple routes to different networks

Having a dynamic route to a specific network

Having a default route to all networks

Having a single route and no other neighbors (correct)

What is the purpose of a default static route?

To create a backup route in case a primary route link fails

To provide a route to any destination beyond the next upstream router (correct)

To route traffic to a specific network

To summarize several contiguous networks as one route

What is a floating static route used for?

To route traffic to any destination beyond the next upstream router

To provide a backup path to a primary static or dynamic route (correct)

To provide a primary route to a specific network

To summarize several contiguous networks as one route

What specifies a directly connected static route?

The router exit interface Signup and view all the answers

What is the destination IPv4 address of a default static route?

0.0.0.0/0 Signup and view all the answers

What determines when a floating static route is used?

When the primary route is not available Signup and view all the answers

What is the purpose of a summary static route?

To summarize several contiguous networks as one route Signup and view all the answers

What is the administrative distance of a floating static route compared to the primary route?

Higher Signup and view all the answers

What is the primary advantage of using static routes in terms of security?

They are not advertised over the network Signup and view all the answers

Which of the following is a disadvantage of using static routing?

They require complete knowledge of the whole network for proper implementation Signup and view all the answers

Which IPv4 routing protocol is an example of a link-state protocol?

OSPF Signup and view all the answers

What is the main benefit of using dynamic routing protocols?

They can automatically learn and adapt to network changes Signup and view all the answers

Which of the following is a use case for static routing?

Routing to and from stub networks Signup and view all the answers

What is the primary difference between RIP and RIPng?

RIP is used for IPv4, while RIPng is used for IPv6 Signup and view all the answers

What is the main advantage of using EIGRP for IPv6?

It is a routing protocol specific to IPv6 Signup and view all the answers

Which of the following is a characteristic of static routes?

They are manually configured and maintained Signup and view all the answers

What does the Administrative Distance value represent in the Routing Table?

The trustworthiness of the route Signup and view all the answers

What is the purpose of the show ip route command?

To display the contents of the routing table Signup and view all the answers

What type of route is created when an interface is configured and active?

Directly connected route Signup and view all the answers

What is the benefit of using static routes?

Improved security and control of resources Signup and view all the answers

What is the purpose of a dynamic routing protocol?

To share information about the reachability and status of remote networks Signup and view all the answers

What is the syntax of a default static route?

ip route 0.0.0.0 0.0.0.0 exit-intf Signup and view all the answers

What happens when a topology change occurs in a static route environment?

The route must be manually updated Signup and view all the answers

What type of routes are added to the routing table when EIGRP or OSPF are implemented?

Dynamic routes Signup and view all the answers

Study Notes

Dynamic Routing Protocols

Cisco ISR routers support various dynamic IPv4 routing protocols, including EIGRP, OSPF, IS-IS, and RIP.
Cisco ISR routers also support dynamic IPv6 routing protocols, including RIPng, OSPF v3, EIGRP for IPv6, and MP-BGP4.

Static Routing

Routers can learn about remote networks through manual or dynamic configuration.
Static routes are manually entered into the route table, providing better security and using less bandwidth.
Static routes have a fixed path and do not require CPU cycles for calculation and communication.
However, static routing has disadvantages, including time-consuming initial configuration and maintenance, error-prone configuration, and the need for administrator intervention.

Why Use Static Routing?

Static routing provides advantages, including better security, reduced bandwidth usage, and fixed path determination.
However, static routing has disadvantages, including time-consuming initial configuration and maintenance, error-prone configuration, and the need for administrator intervention.

When to Use Static Routes

Static routing is suitable for smaller networks that are not expected to grow significantly.
Static routing is used for routing to and from stub networks, which are networks accessed by a single route.
Static routing is used to create a single default route to represent a path to any network that does not have a more specific match with another route in the routing table.

Types of Static Routes

Static routes can be used to connect to a specific network, provide a gateway of last resort for a stub network, reduce the number of routes advertised by summarizing several contiguous networks, and create a backup route in case a primary route link fails.
Default static routes are used to send traffic to any destination beyond the next upstream router.
Default static routes are configured with a destination IPv4 address of 0.0.0.0/0.
Summary static routes are used to reduce the number of routes advertised by summarizing several contiguous networks.
Floating static routes are used to provide a backup path to a primary static or dynamic route in the event of a link failure.

Configure IPv4 Static Routes

The next hop can be identified by an IP address, exit interface, or both.
There are three types of routes: next-hop route, directly connected static route, and both.
Administrative Distance is the "trustworthiness" of the route, with lower values indicating higher trustworthiness.

The Routing Table

The routing table is a file stored in RAM that contains information about directly connected routes, remote routes, and network or next hop associations.
The show ip route command is used to display the contents of the routing table.
Routing table sources include link local interfaces, directly connected interfaces, static routes, and dynamic routing protocols.

Directly Connected Routes

A newly deployed router without any configured interfaces has an empty routing table.
An active, configured directly connected interface creates two routing table entries: Link Local (L) and Directly Connected (C).

Statically Learned Routes

Static routes are manually configured and define an explicit path between two networking devices.
Static routes must be manually updated if the topology changes.
Benefits of static routes include improved security and control of resources.
The syntax for a static route to a specific network is ip route network mask {next-hop-ip | exit-intf}.
The syntax for a default static route is ip route 0.0.0.0 0.0.0.0 {exit-intf | next-hop-ip}.

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Description

This quiz covers various dynamic routing protocols supported by Cisco ISR routers, including EIGRP, OSPF, IS-IS, RIP, and RIPng for IPv4 and IPv6.