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Q9. A network engineer is investigating the cause of a service disruption on a network segment and executes the debug condition interface fastethernet f0/0 command. In which situation is the debugging output generated?
A. when packets on the interface are received and the interface is operational
B. when packets on the interface are received and logging buffered is enabled
C. when packets on the interface are received and forwarded to a configured syslog server
D. when packets on the interface are received and the interface is shut down
Answer: A
Explanation:
Q10. Which three items can you track when you use two time stamps with IP SLAs? (Choose three.)
A. delay
B. jitter
C. packet loss
D. load
E. throughput
F. path
Answer: A,B,C
Q11. A router with an interface that is configured with ipv6 address autoconfig also has a link-local address assigned. Which message is required to obtain a global unicast address when a router is present?
A. DHCPv6 request
B. router-advertisement
C. neighbor-solicitation
D. redirect
Answer: B
Explanation:
Autoconfiguration is performed on multicast-enabled links only and begins when a multicastenabled
interface is enabled (during system startup or manually). Nodes (both, hosts and routers) begin
the process by generating a link-local address for the interface. It is formed by appending the interface
identifier to well-known link-local prefix FE80 :: 0. The interface identifier replaces the right-most zeroes of
the link-local prefix. Before the link-local address can be assigned to the interface, the node performs the
Duplicate Address Detection mechanism to see if any other node is using the same link-local address on
the link. It does this by sending a Neighbor Solicitation message with target address as the "tentative"
address and destination address as the solicited-node multicast address corresponding to this tentative
address. If a node responds with a Neighbor Advertisement message with tentative address as the target
address, the address is a duplicate address and must not be used. Hence, manual configuration is
required. Once the node verifies that its tentative address is unique on the link, it assigns that link-local
address to the interface. At this stage, it has IP-connectivity to other neighbors on this link. The
autoconfiguration on the routers stop at this stage, further tasks are performed only by the hosts. The
routers will need manual configuration (or stateful configuration) to receive site-local or global addresses.
The next phase involves obtaining Router Advertisements from routers if any routers are present on the
link. If no routers are present, a stateful configuration is required. If routers are present, the Router
Advertisements notify what sort of configurations the hosts need to do and the hosts receive a global
unicast IPv6 address. Reference: https://sites.google.com/site/amitsciscozone/home/important-tips/ipv6/
ipv6-stateless- autoconfiguration
Q12. A network engineer is trying to modify an existing active NAT configuration on an IOS router by using the following command:
(config)# no ip nat pool dynamic-nat-pool 192.1.1.20 192.1.1.254 netmask 255.255.255.0
Upon entering the command on the IOS router, the following message is seen on the console:
%Dynamic Mapping in Use, Cannot remove message or the %Pool outpool in use, cannot destroy
What is the least impactful method that the engineer can use to modify the existing IP NAT configuration?
A. Clear the IP NAT translations using the clear ip nat traffic * " command, then replace the NAT configuration quickly, before any new NAT entries are populated into the translation table due to active NAT traffic.
B. Clear the IP NAT translations using the clear ip nat translation * " command, then replace the NAT configuration quickly, before any new NAT entries are populated into the translation table due to active NAT traffic.
C. Clear the IP NAT translations using the reload command on the router, then replace the NAT configuration quickly, before any new NAT entries are populated into the translation table due to active NAT traffic.
D. Clear the IP NAT translations using the clear ip nat table * " command, then replace the NAT configuration quickly, before any new NAT entries are populated into the translation table due to active NAT traffic.
Answer: B
Explanation:
Q13. Refer to the exhibit.
Which statement is true?
A. Traffic from the 172.16.0.0/16 network will be blocked by the ACL.
B. The 10.0.0.0/8 network will not be advertised by Router B because the network statement for the 10.0.0.0/8 network is missing from Router B.
C. The 10.0.0.0/8 network will not be in the routing table on Router B.
D. Users on the 10.0.0.0/8 network can successfully ping users on the 192.168.5.0/24 network, but users on the 192.168.5.0/24 cannot successfully ping users on the 10.0.0.0/8 network.
E. Router B will not advertise the 10.0.0.0/8 network because it is blocked by the ACL.
Answer: E
Explanation:
Q14. A corporate policy requires PPPoE to be enabled and to maintain a connection with the ISP, even if no interesting traffic exists. Which feature can be used to accomplish this task?
A. TCP Adjust
B. Dialer Persistent
C. PPPoE Groups
D. half-bridging
E. Peer Neighbor Route
Answer: B
Explanation:
A new interface configuration command, dialer persistent, allows a dial-on-demand routing (DDR) dialer
profile connection to be brought up without being triggered by interesting traffic. When configured, the dialer persistent command starts a timer when the dialer interface starts up and starts the connection when the timer expires. If interesting traffic arrives before the timer expires, the connection is still brought up and set as persistent. The command provides a default timer interval, or you can set a custom timer interval. To configure a dialer interface as persistent, use the following commands beginning in global configuration mode:
Command Purpose
Step 1 Router(config)# interface dialer Creates a dialer interface and number enters interface
Configuration mode.
Step 2 Router(config-if)# ip address Specifies the IP address and mask address mask of the dialer
interface as a node in the destination network to be called.
Step 3 Router(config-if)# encapsulation Specifies the encapsulation type.
type
Step 4 Router(config-if)# dialer string Specifies the remote destination to dial-string class class-name call
and the map class that defines characteristics for calls to this destination.
Step 5 Router(config-if)# dialer pool Specifies the dialing pool to use number for calls to this destination.
Step 6 Router(config-if)# dialer-group Assigns the dialer interface to a group-number dialer group.
Step 7 Router(config-if)# dialer-list Specifies an access list by list dialer-group protocol protocol- number or
by protocol and list name {permit | deny | list number to define the interesting access-list-number} packets that can trigger a call. Step 8 Router(config-if)# dialer
(Optional) Specifies the remote-name user-name
authentication name of the remote router on the destination subnetwork for a dialer interface.
Step 9 Router(config-if)# dialer Forces a dialer interface to be persistent [delay [initial] connected at all
times, even in seconds | max-attempts the absence of interesting traffic.
number]
Reference:
http://www.cisco.com/c/en/us/td/docs/ios/dial/configuration/guide/12_4t/dia_12_4t_book/dia_dia
ler_persist.html
Q15. Which NetFlow component is applied to an interface and collects information about flows?
A. flow monitor
B. flow exporter
C. flow sampler
D. flow collector
Answer: A
Explanation:
Flow monitors are the NetFlow component that is applied to interfaces to perform network
traffic monitoring. Flow monitors consist of a record and a cache. You add the record to the flow monitor
after you create the flow monitor. The flow monitor cache is automatically created at the time the flow
monitor is applied to the first interface. Flow data is collected from the network traffic during the monitoring
process based on the key and nonkey fields in the record, which is configured for the flow monitor and
stored in the flow monitor cache. Reference: http://www.cisco.com/c/en/us/td/docs/ios/fnetflow/command/
reference/fnf_book/fnf_01.html#w p1314030
Q16. Which IPv6 address type is seen as the next-hop address in the output of the show ipv6 rip RIPng database command?
A. link-local
B. global
C. site-local
D. anycast
E. multicast
Answer: A
Explanation: