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Q1. Refer to the exhibit. When summarizing these routes, which route is the summarized route?
A. OI 2001:DB8::/48 [110/100] via FE80::A8BB:CCFF:FE00:6F00, Ethernet0/0
B. OI 2001:DB8::/24 [110/100] via FE80::A8BB:CCFF:FE00:6F00, Ethernet0/0
C. OI 2001:DB8::/32 [110/100] via FE80::A8BB:CCFF:FE00:6F00, Ethernet0/0
D. OI 2001:DB8::/64 [110/100] via FE80::A8BB:CCFF:FE00:6F00, Ethernet0/0
Answer: A
Explanation:
Q2. For troubleshooting purposes, which method can you use in combination with the “debug ip packet” command to limit the amount of output data?
A. You can disable the IP route cache globally.
B. You can use the KRON scheduler.
C. You can use an extended access list.
D. You can use an IOS parser.
E. You can use the RITE traffic exporter.
Answer: C
Explanation:
The debug ip packet command generates a substantial amount of output and uses a substantial amount of
system resources. This command should be used with caution in production networks. Always use with the access-list command to apply an extended ACL to the debug output. Reference: http://www.cisco.com/c/en/us/support/docs/security/dynamic-multipoint-vpn-dmvpn/111976-dmvpn-troubleshoot-00.html
Q3. Refer to the exhibit.
Which command only announces the 1.2.3.0/24 network out of FastEthernet 0/0?
A. distribute list 1 out
B. distribute list 1 out FastEthernet0/0
C. distribute list 2 out
D. distribute list 2 out FastEthernet0/0
Answer: D
Explanation:
Access list 2 is more specific, allowing only 1.2.3.0/24, whereas access list 1 permits all 1.0.0.0/8
networks. This question also asks us to apply this distribute list only to the outbound direction of the fast Ethernet 0/0 interface, so the correct command is "distribute list 2
out FastEthernet0/0."
Q4. Which protocol uses dynamic address mapping to request the next-hop protocol address for a specific connection?
A. Frame Relay inverse ARP
B. static DLCI mapping
C. Frame Relay broadcast queue
D. dynamic DLCI mapping
Answer: A
Explanation:
Dynamic address mapping uses Frame Relay Inverse ARP to request the next-hop protocol address for a
specific connection, given its known DLCI. Responses to
Inverse ARP requests are entered in an address-to-DLCI mapping table on the router or access server; the
table is then used to supply the next-hop protocol
address or the DLCI for outgoing traffic.
Reference:
http://www.cisco.com/c/en/us/td/docs/ios/12_2/wan/configuration/guide/fwan_c/wcffrely.html
Q5. CORRECT TEXT
JS Industries has expanded their business with the addition of their first remote office. The remote office router (R3) was previously configured and all corporate subnets were reachable from R3. JS Industries is interested in using route summarization along with the EIGRP Stub Routing feature to increase network stability while reducing the memory usage and bandwidth utilization to R3. Another network professional was tasked with implementing this solution. However, in the process of configuring EIGRP stub routing connectivity with the remote network devices off of R3 has been lost.
Currently EIGRP is configured on all routers R2, R3, and R4 in the network. Your task is to identify and resolve the cause of connectivity failure with the remote office router R3. Once the issue has been resolved you should complete the task by configuring route summarization only to the remote office router R3.
You have corrected the fault when pings from R2 to the R3 LAN interface are successful, and the R3 IP routing table only contains 2 10.0.0.0 subnets.
Answer: Here are the solution as below:
Explanation:
First we have to figure out why R3 and R4 can not communicate with each other. Use the show running-config command on router R3.
Notice that R3 is configured as a stub receive-only router. The receive-only keyword will restrict the router from sharing any of its routes with any other router in that EIGRP autonomous system. This keyword will also prevent any type of route from being sent. Therefore we will remove this command and replace it with the eigrp stub command:
R3# configure terminal
R3(config)# router eigrp 123
R3(config-router)# no eigrp stub receive-only
R3(config-router)# eigrp stub
R3(config-router)# end
Now R3 will send updates containing its connected and summary routes to other routers. Notice that the eigrp stub command equals to the eigrp stub connected summary because the connected and summary options are enabled by default. Next we will configure router R3 so that it has only 2 subnets of 10.0.0.0 network. Use the show ip route command on R3 to view its routing table:
Because we want the routing table of R3 only have 2 subnets so we have to summary sub-networks at the interface which is connected with R3, the s0/0 interface of R4.
There is one interesting thing about the output of the show ip route shown above: the 10.2.3.0/24, which is a directly connected network of R3. We can’t get rid of it in the routing table no matter what technique we use to summary the networks. Therefore, to make the routing table of R3 has only 2 subnets we have to summary other subnets into one subnet.
In the output if we don’t see the summary line (like 10.0.0.0/8 is a summary…) then we should use the command ip summary-address eigrp 123 10.2.0.0 255.255.0.0 so that all the ping can work well.
In conclusion, we will use the ip summary-address eigrp 123 10.2.0.0 255.255.0.0 at the interface s0/0 of R4 to summary.
R4> enable
R4# conf t
R4(config)# interface s0/0
R4(config-if)# ip summary-address eigrp 123 10.2.0.0 255.255.0.0
Now we jump back to R3 and use the show ip route command to verify the effect, the output is shown below:
Note: Please notice that the IP addresses and the subnet masks in your real exam might be different so you might use different ones to solve this question. Just for your information, notice that if you use another network than 10.0.0.0/8 to summary, for example, if you use the command ip summary-address eigrp 123 10.2.0.0 255.255.0.0 you will leave a /16 network in the output of the show ip route command.
But in your real exam, if you don’t see the line "10.0.0.0/8 is a summary, Null0" then you can summarize using the network 10.2.0.0/16. This summarization is better because all the pings can work well. Finally don’t forget to use the copy run start command on routers R3 and R4 to save the configurations. R3(config-if)# end R3# copy run start R4(config-if)# end R4# copy run start
If the “copy run start” command doesn’t work then use “write memory.”
Q6. A network engineer executes the show ip flow export command. Which line in the output indicates that the send queue is full and export packets are not being sent?
A. output drops
B. enqueuing for the RP
C. fragmentation failures
D. adjacency issues
Answer: A
Explanation:
Table 5 show ip flow export Field Descriptions Field Description Exporting flows to 10.1.1.1
Specifies the export destinations and ports. (1000) and 10.2.1.1 The ports are in parentheses. Exporting
using source Specifies the source address or interface. IP address 10.3.1.1 Version 5 flow records
Specifies the version of the flow. 11 flows exported in 8 udp The total number of export packets sent, and
datagrams the total number of flows contained within them. 0 flows failed due to lack of No memory was
available to create an export export packet packet. 0 export packets were sent The packet could not be
processed by CEF or up to process level by fast switching, possibly because another feature requires
running on the packet. 0 export packets were Indicates that CEF was unable to switch the dropped due to
no fib packet or forward it up to the process level. 0 export packets were dropped due to adjacency issues
0 export packets were Indicates that the packet was dropped because dropped due to of problems
constructing the IP packet. fragmentation failures 0 export packets were dropped due to encapsulation
fixup failures 0 export packets were Indicates that there was a problem transferring dropped enqueuing for
the the export packet between the RP and the line RP card. 0 export packets were dropped due to IPC
rate limiting 0 export packets were Indicates that the send queue was full while dropped due to output the
packet was being transmitted. drops
Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_0s/feature/guide/oaggnf.html
Q7. Refer to the exhibit.
Which statement about the output of the show flow-sampler command is true?
A. The sampler matched 10 packets, each packet randomly chosen from every group of 100 packets.
B. The sampler matched 10 packets, one packet every 100 packets.
C. The sampler matched 10 packets, each one randomly chosen from every 100-second interval.
D. The sampler matched 10 packets, one packet every 100 seconds.
Answer: A
Explanation:
The sampling mode determines the algorithm that selects a subset of traffic for NetFlow
processing. In the random sampling mode that Random Sampled NetFlow uses, incoming packets are
randomly selected so that one out of each n sequential packets is selected on average for NetFlow
processing. For example, if you set the sampling rate to 1 out of 100 packets, then NetFlow might sample
the 5th, 120th, 199th, 302nd, and so on packets. This sample configuration provides NetFlow data on 1
percent of total traffic. The n value is a parameter from 1 to 65535 packets that you can configure. Table 2
show flow-sampler Field Descriptions Field Description Sampler Name of the flow sampler id Unique ID of
the flow sampler packets matched Number of packets matched for the flow sampler mode Flow sampling
mode sampling interval is Flow sampling interval (in packets) Reference: http://www.cisco.com/c/en/us/td/
docs/ios/12_0s/feature/guide/nfstatsa.html#wp1084291
Q8. A network administrator uses IP SLA to measure UDP performance and notices that packets on one router have a higher one-way delay compared to the opposite direction. Which UDP characteristic does this scenario describe?
A. latency
B. starvation
C. connectionless communication
D. nonsequencing unordered packets
E. jitter
Answer: A
Explanation:
Cisco IOS IP SLAs provides a proactive notification feature with an SNMP trap. Each measurement
operation can monitor against a pre-set performance threshold.
Cisco IOS IP SLAs generates an SNMP trap to alert management applications if this threshold is crossed.
Several SNMP traps are available: round trip time, average jitter, one-way latency, jitter, packet loss, MOS, and connectivity tests.
Here is a partial sample output from the IP SLA statistics that can be seen:
router#show ip sla statistics 1
Round Trip Time (RTT) for Index 55
Latest RTT: 1 ms
Latest operation start time: *23:43:31.845 UTC Thu Feb 3 2005 Latest operation return code: OK
RTT Values:
Number Of RTT: 10 RTT Min/Avg/Max: 1/1/1 milliseconds Latency one-way time:
Number of Latency one-way Samples: 0
Source to Destination Latency one way Min/Avg/Max: 0/0/0 milliseconds Destination to Source Latency
one way Min/Avg/Max: 0/0/0 milliseconds
Reference:
http://www.cisco.com/en/US/technologies/tk648/tk362/tk920/technologies_white_paper09186a0
0802d5efe.html
Q9. What are the three modes of Unicast Reverse Path Forwarding?
A. strict mode, loose mode, and VRF mode
B. strict mode, loose mode, and broadcast mode
C. strict mode, broadcast mode, and VRF mode
D. broadcast mode, loose mode, and VRF mode
Answer: A
Explanation:
Network administrators can use Unicast Reverse Path Forwarding (Unicast RPF) to help limit
the malicious traffic on an enterprise network. This security feature works by enabling a router to verify the
reachability of the source address in packets being forwarded. This capability can limit the appearance of
spoofed addresses on a network. If the source IP address is not valid, the packet is discarded. Unicast
RPF works in one of three different modes: strict mode, loose mode, or VRF mode. Note that not all
network devices support all three modes of operation. Unicast RPF in VRF mode will not be covered in this
document. When administrators use Unicast RPF in strict mode, the packet must be received on the
interface that the router would use to forward the return packet. Unicast RPF configured in strict mode may
drop legitimate traffic that is received on an interface that was not the router's choice for sending return
traffic. Dropping this legitimate traffic could occur when asymmetric routing paths are present in the
network. When administrators use Unicast RPF in loose mode, the source address must appear in the
routing table. Administrators can change this behavior using the allow-default option, which allows the use
of the default route in the source verification process. Additionally, a packet that contains a source address
for which the return route points to the Null 0 interface will be dropped. An access list may also be
specified that permits or denies certain source addresses in Unicast RPF loose mode. Care must be taken
to ensure that the appropriate Unicast RPF mode (loose or strict) is configured during the deployment of
this feature because it can drop legitimate traffic. Although asymmetric traffic flows may be of concern
when deploying this feature, Unicast RPF loose mode is a scalable option for networks that contain
asymmetric routing paths. Reference: http://www.cisco.com/web/about/security/intelligence/unicastrpf.
html
Q10. Which three characteristics are shared by subinterfaces and associated EVNs? (Choose three.)
A. IP address
B. routing table
C. forwarding table
D. access control lists
E. NetFlow configuration
Answer: A,B,C
Explanation:
A trunk interface can carry traffic for multiple EVNs. To simplify the configuration process, all
the subinterfaces and associated EVNs have the same IP address assigned. In other words, the trunk
interface is identified by the same IP address in different EVN contexts. This is accomplished as a result of
each EVN having a unique routing and forwarding table, thereby enabling support for overlapping IP
addresses across multiple EVNs. Reference: http://www.cisco.com/en/US/docs/ios-xml/ios/evn/
configuration/xe-3sg/evn- overview.pdf