Chapter 15: IP Static Routing

Question 1

Four types of static routes supported by IPv4 and IPv6

Answer 1

• standard static route
• default static route
• floating static route
• summary static route

Question 2

Configuration commands to configure static routes

Answer 2

• ip route

- ipv6 route

Question 3

When configuring static route, next hop can be identified by an IP add, exit interface or both. How the dst is specified creates one of the three following types of static route:

Answer 3

• next-hop route - only next-hop IP add is specified
• directly connected static route - only router exit interface is specified
• fully specified static route - next-hop IP and exit interface are specified

Question 4

what command needs to be issued before ipv6 static routing can be configured?

Answer 4

ipv6 unicast-routing

Question 5

What situation calls for IPv6 fully specified static route to be used? Why?

Answer 5

If the IPv6 static route uses IPv6 link-local add as the next-hop address.
Link-local addresses are only unique on a given link or network.

Question 6

Default static route. Commonly used?

Answer 6

• a static route that matches all packets.

- connecting an edge router to a service provider network or a stub router

Question 7

Floating static route

Answer 7

Static route used to provide a backup path to a primary static or dynamic route, in the event of a link failure. Used only when primary route is not available

Question 8

How is floating static route configured

Answer 8

Configured with a higher administrative distance than the primary route

Question 9

Default administrative distance when configuring static routes

Answer 9

1

Question 10

Host route

Answer 10

An IPv4 with 32-bit mask or IPv6 with 128-bit mask.

Question 11

3 ways that the host route can be added to the routing table

Answer 11

• auto installed when IP add is configured on the router
• configured as a static host value
• host route auto obtained through other methods

Question 12

A network admin is configuring a route to forward packets to a specific web server. What type of route should be configured by the admin?

Answer 12

a host route

Question 13

When routers forwards a packet on a point-to-point link, what is the Layer 2 destination address?

Answer 13

All 1s address is added for the new frame

Question 14

Three commands to isolate problems with a static route?

Answer 14

• ping
• show ip route
• show ip interface brief

Question 15

What is the show cdp neighbor command used for

Answer 15

to obtain info about directly connected Cisco devices

Question 16

Steps a router takes when it receives a packet on an Ethernet interface

Answer 16

1. Router examines dst MAC address
2. Router identifies the Ethernet Type field
3. Router de-encapsulates the Ethernet frame
4. Router examines the dst IP address

Question 17

What happens to a static route entry in a routing table when the outgoing interface associated with the route goes into the down state?

Answer 17

The static route is removed from the routing table

Question 18

What is required in order to have a non-recursive lookup by a router?

Answer 18

A nonrecursive route must have an exit interface specified from which the destination network can be reached.