QUESTION NO: 1
The TestKing network consists of a small office with twenty-five employees that has one connection to the Internet through the TK1 router. What routing configurations are recommended on the TK1 and ISP routers?
A. BGP on both the routers. B. RIP on both the routers. C. Default routes on both routers.
D. BGP on the ISP router and a static route on TK1.
E. A default route on TK1 and a static route on the ISP router. F. None of the above
Answer: E Explanation:
Since private network use RFC 1918 IP address ranges internally, and because of security reasons, it is generally not possible to use an interior routing protocol with the ISP. This eliminates choice B. When connecting to an ISP, usually only BGP or static routes are supported. In this case, since there is only one connection to the Internet, BGP is not needed so choices A and D can be eliminated. A static default route would be needed on router TK1 to route to the Internet. In turn, the ISP only needs a specific static route to reach the LAN of the TestKing network.
Incorrect Answers:
A, D: BGP is not needed on networks that contain only a single link to the Internet. B. Interior routing protocols are generally not supported with an ISP.
C. A default route on the ISP router would send all of their customers Internet traffic to the TestKing network, and not the Internet.
QUESTION NO: 2
A new point to point circuit is installed, connecting Testking 1 to Testking 2 as shown below:
Users at Testking 1 wish to utilize the existing Internet connection at Testking 2. To do this, a gateway of last resort needs to be set. What is the command to do this?
A. TestKing1(config)# ip route 172.16.4.2 0.0.0.0 0.0.0.0 B. TestKing1(config)# ip route 0.0.0.0 0.0.0.0 S1
C. TestKing1(config)# ip route 172.16.4.1 0.0.0.0 0.0.0.0 D. TestKing1(config)# ip route S0 0.0.0.0 0.0.0.0
E. TestKing1(config)# ip route 0.0.0.0 0.0.0.0 172.16.4.2 F. None of the above
Answer: E Explanation:
Setting the default gateway is done by issuing either the "ip route 0.0.0.0 0.0.0.0 serial 0" or the "ip route 0.0.0.0 0.0.0.0 172.16.4.2" command. The following excerpt provides some additional information:
Incorrect Answers:
A, C. The IP address of the next hop needs to go after the route, not before. B. This would have been acceptable if the interface specified was S0, not S1.
C. The interface used to forward packets for the route should be placed after the route, not before.
QUESTION NO: 3
The network associate is configuring OSPF on the Core router shown below. All the connections to the branches should be participating in OSPF. The link to the ISP should NOT participate in OSPF and should only be advertised as the default route. What set of commands will properly configure the Core router?
A. Core(config-router)# default-information originate Core(config-router)# network 10.0.0.00.255.255.255 area 0 Core(config-router)# exit
Core(config)# ip route 0.0.0.00.0.0.010.10.2.14 B. Core(config-router)# default-information originate Core(config-router)# network 10.10.2.32 0.0.0.31 area 0 Core(config-router)# exit
Core(config)# ip route 0.0.0.00.0.0.0 10.10.2.14 C. Core(config-router)# default-information originate Core(config-router)# network 10.10.2.13 0.0.0.242 area 0 Core(config-router)# exit
Core(config)# ip route 0.0.0.00.0.0.010.10.2.14 D. Core(config-router)# default-information originate Core(config-router)# network 10.10.2.16 0.0.0.15 area 0 Core(config-router)# exit
Core(config)# ip route 0.0.0.00.0.0.010.10.2.14
Answer: D Explanation:
There are two ways to inject a default route into a normal area.
1. If the ASBR already has the default route in its routing table, you can advertise the existing 0.0.0.0/0 into the OSPF domain with the default-information originate router configuration command.
2. If the ASBR doesn't have a default route, you can add the keyword always to the default-information originate command (default-information originate always). This command will advertise a default route into the OSPF domain, regardless of whether it has a route to 0.0.0.0. Another benefit of adding always keyword is that it can add stability to the internetwork. For example, if the ASBR is learning a default route from another routing domain such as RIP and this route is flapping, then without the always keyword, each time the route flaps, the ASBR will send a new Type 5 LSA into the OSPF domain causing some instability inside the OSPF domain. With the always keyword, the ASBR will advertise the default inside the OSPF domain always, and thus the flapping of the default route from the RIP domain will not cause any instability inside the OSPF domain.
In the example shown here, only choice D is correct as the wildcard mask correctly specifies the 10.10.2.16 0.0.0.15 networks, which include all IP addresses in the 10.10.2.16-10.10.2.31 range.
Reference: http://www.cisco.com/warp/public/104/21.html
QUESTION NO: 4
The ISP assigned you the class CIP address 207.134.6.0/30 for this Internet
connection. A default route to the Internet should be set up. Which of the following are acceptable ways to configure this on the Gateway router? (Select all that apply)
B. Gateway(config)# router rip
Gateway(config-router)# network 207.134.6.0 default
C. Gateway(config)# ip route 207.134.6.0 255.255.255.0 Serial0/0 D. Gateway(config)# router OSPF
Gateway(config-router)# network 207.134.6.0 E. Gateway(config)# ip default-network 207.134.6.0
Answer: A, E Explanation:
This question only involves the configuration of the gateway router to the ISP, nothing else. You have two choices to accomplish this: the command "ip route" or the command "ip default-network". Both of these methods will configure a default route to the ISP as desired.
Incorrect Answers:
B, D: RIP and OSPF are interior routing protocols. The T1 Internet connection that is being set up here is between two different Autonomous Systems. The only routing protocol that could be potentially used is BGP, but that is not an option.
C: This command will only set up a static route to the 207.134.6.0/24 network. We wish to set up a static default route.
QUESTION NO: 5
Router TestKing2 is connected to an ISP as shown below:
In the ISP link to the WAN shown above, you must complete the connection between the TestKing2 router to the service provider. To accomplish this task, which two devices could be installed at the TestKing site to provide a connection through the local loop to the CO of the provider? (Choose two)
A. Multiplexer B. WAN switch C. ATM switch
D. CSU/DSU E. PVC F. Modem G. LMI
Answer: D, F