What is the effect of the configuration that is shown?
A. It configures SSH globally for all logins. B. It tells the router or switch to try to establish an SSh connection first and if that fails to use Telnet. C. It configures the virtual terminal lines with the password 030752180500. D. It configures a Cisco network device to use the SSH protocol on incoming communications via the virtual terminal ports. E. It allows seven failed login attempts before the VTY lines are temporarily shutdown.
Correct Answer: D
Explanation:
Secure Shell (SSH) is a protocol which provides a secure remote access connection to network devices. Communication between the client and server is encrypted in both SSH version 1 and SSH version 2. If you want to prevent non-SSH connections, add the “transport input ssh” command under the lines to limit the router to SSH connections only.
Straight (non-SSH) Telnets are refused.
Reference: www.cisco.com/warp/public/707/ssh.shtml
What is the reason that the interface status is “administratively down, line protocol down”?
A. There is no encapsulation type configured. B. There is a mismatch in encapsulation types. C. The interface is not receiving any keepalives. D. The interface has been configured with the shutdown command. E. The interface needs to be configured as a DTE device. F. The wrong type of cable is connected to the interface.
Correct Answer: D
Explanation:
Interfaces can be enabled or disabled with shutdown/no shutdown command. If you interface is down, it will display administratively down status. You can bring up an interface having administratively down interface using no shutdown command.
When running OSPF, what would cause router A not to form an adjacency with router B?
A. The loopback addresses are on different subnets. B. The values of the dead timers on the routers are different. C. Route summarization is enabled on both routers. D. The process identifier on router A is different than the process identifier on router B.
Correct Answer: B
Explanation:
To form an adjacency (become neighbor), router A & B must have the same Hello interval, Dead interval and AREA numbers
A router has learned three possible routes that could be used to reach a destination network. One route is from EIGRP and has a composite metric of 20514560. Another route is from OSPF with a metric of 782. The last is from RIPv2 and has a metric of 4. Which route or routes will the router install in the routing table?
A. the OSPF route B. the EIGRP route C. the RIPv2 route D. all three routes E. the OSPF and RIPv2 routes
Correct Answer: B
Explanation:
When one route is advertised by more than one routing protocol, the router will choose to use the routing protocol which has lowest Administrative Distance. The Administrative Distances of popular routing protocols are listed below:
The company uses EIGRP as the routing protocol. What path will packets take from a host on the 192.168.10.192/26 network to a host on the LAN attached to router R1?
A. The path of the packets will be R3 to R2 to R1. B. The path of the packets will be R3 to R1 to R2. C. The path of the packets will be both R3 to R2 to R1 AND R3 to R1. D. The path of the packets will be R3 to R1.
Correct Answer: D
Explanation:
Host on the LAN attached to router R1 belongs to 192.168.10.64/26 subnet. From the output of the routing table of R3 we learn this network can be reach via 192.168.10.9, which is an IP address in 192.168.10.8/30 network (the network between R1 & R3) -> packets destined for 192.168.10.64 will be routed from R3 -> R1 -> LAN on R1.
A network administrator is troubleshooting an EIGRP problem on a router and needs to confirm the IP addresses of the devices with which the router has established adjacency.
The retransmit interval and the queue counts for the adjacent routers also need to be checked. What command will display the required information?
A. Router# show ip eigrp adjacency B. Router# show ip eigrp topology C. Router# show ip eigrp interfaces D. Router# show ip eigrp neighbors
Correct Answer: D
Explanation:
Below is an example of the show ip eigrp neighbors command. The retransmit interval (Smooth Round Trip Timer – SRTT) and the queue counts (Q count, which shows the
number of queued EIGRP packets) for the adjacent routers are listed:
R1 is unable to establish an OSPF neighbor relationship with R3. What are possible reasons for this problem? (Choose two.)
A. All of the routers need to be configured for backbone Area 1. B. R1 and R2 are the DR and BDR, so OSPF will not establish neighbor adjacency with R3. C. A static route has been configured from R1 to R3 and prevents the neighbor adjacency from being established. D. The hello and dead interval timers are not set to the same values on R1 and R3. E. EIGRP is also configured on these routers with a lower administrative distance. F. R1 and R3 are configured in different areas.
Correct Answers: D,F
Explanation:
This question is to examine the conditions for OSPF to create neighborhood.
So as to make the two routers become neighbors, each router must be matched with the following items:
1. The area ID and its types;
2. Hello and failure time interval timer;
3. OSPF Password (Optional).
A. a command that is set once and affects the entire router B. a command that is implemented in all foreign and domestic IOS versions C. a command that is universal in application and supports all protocols D. a command that is available in every release of IOS, regardless of the version or deployment status E. a command that can be entered in any configuration mode
Correct Answer: A
Explanation:
When you enter global configuration mode and enter a command, it is applied to the running configuration file that is currently running in ram. The configuration of a global command affects the entire router. An example of a global command is one used for the hostname of the router.
Incorrect Answers:
– Global configuration commands must be performed while in global configuration mode. For example, when you are in the interface configuration mode, you most likely will
need to exit out into global mode to type in the commands.
– Global commands do not necessarily support every protocol.
– This is not necessarily true, since there are certain global commands that are supported on one feature set that are not on a different feature set of IOS.
– Global commands can become outdated, and can be replaced by newer commands in the newer releases of IOS.
When running EIGRP, what is required for RouterA to exchange routing updates with RouterC?
A. AS numbers must be changed to match on all the routers B. Loopback interfaces must be configured so a DR is elected C. The no auto-summary command is needed on Router A and Router C D. Router B needs to have two network statements, one for each connected network
Correct Answer: A
Explanation:
This question is to examine the understanding of the interaction between EIGRP routers.
The following information must be matched so as to create neighborhood.
EIGRP routers to establish, must match the following information:
1. AS Number;
2. K value.
A Cisco router is booting and has just completed the POST process. It is now ready to find and load an IOS image. What function does the router perform next?
A. It checks the configuration register. B. It attempts to boot from a TFTP server. C. It loads the first image file in flash memory. D. It inspects the configuration file in NVRAM for boot instructions.
Correct Answer: A
Explanation:
Default (normal) Boot Sequence
Power on Router – Router does POST – Bootstrap starts IOS load – Check configuration register to see what mode the router should boot up in (usually 0x2102 to read startupconfig in NVRAM / or 0x2142 to start in “setup-mode”) – check the startup-config file in NVRAM for boot-system commands – load IOS from Flash.
