CISCO CCNA Exam – Q168

A router receives information about network 192.168.10.0/24 from multiple sources. What will the router consider the most reliable information about the path to that network?

A. a directly connected interface with an address of 192.168.10.254/24
B. a static route to network 192.168.10.0/24
C. a RIP update for network 192.168.10.0/24
D. an OSPF update for network 192.168.0.0/16
E. a default route with a next hop address of 192.168.10.1
F. a static route to network 192.168.10.0/24 with a local serial interface configured as the next hop

Correct Answer: A

Explanation:
When there is more than one way to reach a destination, it will choose the best one based on a couple of things. First, it will choose the route that has the longest match; meaning the most specific route. So, in this case the /24 routes will be chosen over the /16 routes. Next, from all the /24 routes it will choose the one with the lowest administrative distance. Directly connected routes have an AD of 1 so this will be the route chosen.

CISCO CCNA Exam – Q167

What is the default maximum number of equal-cost paths that can be placed into the routing table of a Cisco OSPF router?

A. 2
B. 8
C. 16
D. unlimited

Correct Answer: B

Explanation:
maximum-paths (OSPF)
To control the maximum number of parallel routes that Open Shortest Path First (OSPF) can support, use the maximum-paths command.

CISCO CCNA Exam – Q167
Command Default
8 paths

CISCO CCNA Exam – Q166

Which command shows your active Telnet connections?

A. show cdp neigbors
B. show session
C. show users
D. show vty logins

Correct Answer: B

Explanation:
The “show users” shows telnet/ssh connections to your router while “show sessions” shows telnet/ssh connections from your router (to other devices). The question asks about “your active Telnet connections”, meaning connections from your router so the answer should be A.

CISCO CCNA Exam – Q165

Which type of EIGRP route entry describes a feasible successor?

A. a backup route, stored in the routing table
B. a primary route, stored in the routing table
C. a backup route, stored in the topology table
D. a primary route, stored in the topology table

Correct Answer: C

Explanation:
EIGRP uses the Neighbor Table to list adjacent routers. The Topology Table list all the learned routers to destination whilst the Routing Table contains the best route to a destination, which is known as the Successor. The Feasible Successor is a backup route to a destination which is kept in the Topology Table.

CISCO CCNA Exam – Q164

The network administrator cannot connect to Switch1 over a Telnet session, although the hosts attached to Switch1 can ping the interface Fa0/0 of the router.
Given the information in the graphic and assuming that the router and Switch2 are configured properly, which of the following commands should be issued on Switch1 to correct this problem?

A.
Switch1(config)# line con0
Switch1(config-line)# password cisco
Switch1(config-line)#login
B.
Switch1(config)# interface fa0/1
Switch1(config-if)# ip address 192.168.24.3 255.255.255.0
C.
Switch1(config)# ip default-gateway 192.168.24.1
D.
Switch1(config)# interface fa0/1
Switch1(config-if)# duplex full
Switch1(config-if)# speed 100
E.
Switch1(config)# interface fa0/1
Switch1(config-if)# switchport mode trunk

Correct Answer: C

Explanation:
Since we know hosts can reach the router through the switch, we know that connectivity, duplex. Speed, etc. are good. However, for the switch itself to reach networks outside the local one, the ip default-gateway command must be used.

CISCO CCNA Exam – Q163

Refer to the exhibit.
CISCO CCNA Exam – Q163

Which of these statements correctly describes the state of the switch once the boot process has been completed?

A. As FastEthernet0/12 will be the last to come up, it will be blocked by STP.
B. Remote access management of this switch will not be possible without configuration change.
C. More VLANs will need to be created for this switch.
D. The switch will need a different IOS code in order to support VLANs and STP.

Correct Answer: B

Explanation:
Notice the line, which says “Interface VLAN1, changed state to administratively down”. This shows that VLAN1 is shut down. Hence remote management of this switch is not possible unless VLAN1 is brought back up. Since VLAN1 is the only interface shown in the output, you have to assume that no other VLAN interface has been configured with an IP Address.

Incorrect Answers:
A. Whether a port is blocked or not by STP does not depend on the order in which the port became active.
C. Whether or not more VLANs are needed is not clear form the output.
D. 12.2(25)SEE2 LANBASE IOS code is capable of handling VLANs and STP. In general any 12.2 code can handle these features.

CISCO CCNA Exam – Q162

Two routers named Atlanta and Brevard are connected via their serial interfaces as illustrated, but they are unable to communicate. The Atlanta router is known to have the correct configuration.
CISCO CCNA Exam – Q162

Given the partial configurations, identify the fault on the Brevard router that is causing the lack of connectivity.

A. incompatible IP address
B. insufficient bandwidth
C. incorrect subnet mask
D. incompatible encapsulation
E. link reliability too low
F. IPCP closed

Correct Answer: D

Explanation:
Because Interface Serial 0 of Atlanta Router has 192.168.10.1 And Interface Serial 1 of Router Brevard has 192.168.11.2. These are from different network.

CISCO CCNA Exam – Q161

Users on the 172.17.22.0 network cannot reach the server located on the 172.31.5.0 network. The network administrator connected to router Coffee via the console port, issued the show ip route command, and was able to ping the server.
CISCO CCNA Exam – Q161

Based on the output of the show ip route command and the topology shown in the graphic, what is the cause of the failure?

A. The network has not fully converged.
B. IP routing is not enabled.
C. A static route is configured incorrectly.
D. The FastEthernet interface on Coffee is disabled.
E. The neighbor relationship table is not correctly updated.
F. The routing table on Coffee has not updated.

Correct Answer: C

Explanation:
The default route or the static route was configured with incorrect next-hop ip address 172.19.22.2. The correct IP address will be 172.18.22.2 to reach server located on 172.31.5.0 network. IP route 0.0.0.0 0.0.0.0 172.18.22.2

CISCO CCNA Exam – Q160

A network administrator is trying to add a new router into an established OSPF network. The networks attached to the new router do not appear in the routing tables of the other OSPF routers. Given the information in the partial configuration shown below, what configuration error is causing this problem?

Router(config)# router ospf 1
Router(config-router)# network 10.0.0.0 255.0.0.0 area 0

A. The process id is configured improperly.
B. The OSPF area is configured improperly.
C. The network wildcard mask is configured improperly.
D. The network number is configured improperly.
E. The AS is configured improperly.
F. The network subnet mask is configured improperly.

Correct Answer: C

Explanation:
When configuring OSPF, the mask used for the network statement is a wildcard mask similar to an access list. In this specific example, the correct syntax would have been “network 10.0.0.0 0.0.0.255 area 0.”

CISCO CCNA Exam – Q159

Which two statements about the OSPF Router ID are true? (Choose two.)

A. It identifies the source of a Type 1 LSA.
B. It should be the same on all routers in an OSPF routing instance.
C. By default, the lowest IP address on the router becomes the OSPF Router ID.
D. The router automatically chooses the IP address of a loopback as the OSPF Router ID.
E. It is created using the MAC Address of the loopback interface.

Correct Answers: A, D

Explanation:
r120#show ip ospf data
OSPF Router with ID (10.0.0.120) (Process ID 1)
Next, who are the other routers in our area?
Router Link States (Area 1)
Link ID ADV Router Age Seq# Checksum Link count
10.0.0.111 10.0.0.111 600 0x8000023A 0x0092B3 1
10.0.0.112 10.0.0.112 1246 0x80000234 0x009CAC 1
10.0.0.113 10.0.0.113 148 0x8000022C 0x004399 3
10.0.0.120 10.0.0.120 152 0x80000240 0x0046CB 1

We can see OSPF Router ID will be used as source of Type 1 LSA. Also the router will chose the highest loopback interface as its OSPF router ID (if available).