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Q151. Which option describes how a router responds if LSA throttling is configured and it receives the identical LSA before the interval is set?
A. The LSA is added to the OSPF database and a notification is sent to the sending router to slow down its LSA packet updates.
B. The LSA is added to the OSPF database.
C. The LSA is ignored.
D. The LSA is ignored and a notification is sent to the sending router to slow down its LSA packet updates.
Answer: C
Explanation:
How OSPF LSA Throttling Works
The timers throttle lsa all command controls the generation (sending) of LSAs. The first LSA is always generated immediately upon an OSPF topology change, and the next LSA generated is controlled by the minimum start interval. The subsequent LSAs generated for the same LSA are rate-limited until the maximum interval is reached. The "same LSA" is defined as an LSA instance that contains the same LSA ID number, LSA type, and advertising router ID.
The timers LSA arrival command controls the minimum interval for accepting the same LSA. If an instance of the same LSA arrives sooner than the interval that is set, the LSA is dropped. It is recommended that the arrival interval be less than or equal to the hold-time interval of the timers throttle lsa all command.
Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_0s/feature/guide/fsolsath.html
Q152. Which technology can MSDP SA filters use to filter traffic?
A. route maps
B. community lists
C. prefix lists
D. class maps
Answer: A
Q153. Refer to the exhibit.
Which statement is true?
A. IS-IS has been enabled on R4 for IPv6, single-topology.
B. IS-IS has been enabled on R4 for IPv6, multitopology.
C. IS-IS has been enabled on R4 for IPv6, single-topology and multitopology.
D. R4 advertises IPv6 prefixes, but it does not forward IPv6 traffic, because the protocol has not been enabled under router IS-IS.
Answer: A
Explanation:
When working with IPv6 prefixes in IS-IS, you can configure IS-IS to be in a single topology for both IPv4 and IPv6 or to run different topologies for IPv4 and IPv6. By default, IS-IS works in single-topology mode when activating IPv4 and IPv6. This means that the IS-IS topology will be built based on IS Reachability TLVs. When the base topology is built, then IPv4 prefixes (IP Reachability TLV) and IPv6 prefixes (IPv6 Reachability TLV) are added to each node as leaves, without checking if there is IPv6 connectivity between nodes.
Reference: https://blog.initialdraft.com/archives/3381/
Q154. Which three options are components of an EEM CLI policy? (Choose three.)
A. Safe-Tcl
B. applet name
C. Fast Tcl
D. event
E. action
F. Tcl bytecode
Answer: B,D,E
Explanation:
The Embedded Event Manager (EEM) monitors events that occur on your device and takes action to recover or troubleshoot these events, based on your configuration.
EEM consists of three major components:
Event statements — Events to monitor from another Cisco NX-OS component that might require some action, workaround, or notification.
Action statements — An action that EEM can take, such as sending an e-mail, or disabling an interface, to recover from an event.
Policies — An applet name paired with one or more actions to troubleshoot or recover from the event.
Reference:
http://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus5500/sw/system_manage ment/6x/b_5500_System_Mgmt_Config_6x/b_5500_System_Mgmt_Config_6x_chapter_01 0011.html
Q155. Which variable in an EEM applet is set when you use the sync yes option?
A. $_cli_result
B. $_result
C. $_string_result
D. $_exit_status
Answer: D
Explanation:
The CLI event detector screens CLI commands for a regular expression match. When a match is found, an event is published. The match logic is performed on the fully expanded CLI command after the command is successfully parsed and before it is executed. The CLI event detector supports three publish modes:
. Synchronous publishing of CLI events--The CLI command is not executed until the EEM policy exits, and the EEM policy can control whether the command is executed. The read/write variable, _exit_status, allows you to set the exit status at policy exit for policies triggered from synchronous events. If _exit_status is 0, the command is skipped, if _exit_status is 1, the command is run.
. Asynchronous publishing of CLI events--The CLI event is published, and then the CLI command is executed.
. Asynchronous publishing of CLI events with command skipping--The CLI event is published, but the CLI command is not executed.
Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/eem/command/eem-cr-
book/eem-cr-e1.html
Update 400-101 ccie written exam price:
Q156. What is the function of an EIGRP sequence TLV packet?
A. to acknowledge a set of sequence numbers during the startup update process
B. to list the peers that should listen to the next multicast packet during the reliable multicast process
C. to list the peers that should not listen to the next multicast packet during the reliable multicast process
D. to define the initial sequence number when bringing up a new peer
Answer: C
Explanation:
EIGRP sends updates and other information between routers using multicast packets to 224.0.0.10. For example in the topology below, R1 made a change in the topology and it needs to send updates to R2 & R3. It sends multicast packets to EIGRP multicast address 224.0.0.10. Both R2 & R3 can receive the updates and acknowledge back to R1 using unicast. Simple, right? But what if R1 sends out updates, only R2 replies but R3 never does? In the case a router sends out a multicast packet that must be reliable delivered (like in this case), an EIGRP process will wait until the RTO (retransmission timeout) period has passed before beginning a recovery action. This period is calculated from the SRTT (smooth round-trip time). After R1 sends out updates it will wait for this period to expire. Then it makes a list of all the neighbors from which it did not receive an Acknowledgement (ACK). Next it sends out a packet telling these routers stop listening to multicast until they are been notified that it is safe again. Finally the router will begin sending unicast packets with the information to the routers that didn’t answer, continuing until they are caught up. In our example the process will be like this:
1. R1 sends out updates to 224.0.0.10
2. R2 responds but R3 does not
3. R1 waits for the RTO period to expire
4. R1 then sends out an unreliable-multicast packet, called a sequence TLV (Type-Length-Value) packet, which tells R3 not to listen to multicast packets any more
5. R1 continues sending any other muticast traffic it has and delivering all traffic, using unicast to R3, until it acknowledges all the packets
6. Once R3 has caught up, R1 will send another sequence TLV, telling R3 to begin listening to multicast again. The sequence TLV packet contains a list of the nodes that should not listen to multicast packets while the recovery takes place. But notice that the TLV packet in step 6 does not contain any nodes in the list.
Note. In the case R3 still does not reply in step 4, R1 will attempt to retransmit the unicast 16 times or continue to retransmit until the hold time for the neighbor in question expires. After this time, R1 will declare a retransmission limit exceeded error and will reset the neighbor.
(Reference: EIGRP for IP: Basic Operation and Configuration)
Q157. Which two statements are characteristics of Ethernet private LAN circuits? (Choose two.)
A. They support communication between two or more customer endpoints.
B. They utilize more than one bridge domain.
C. They support point-to-multipoint EVC.
D. They support multipoint-to-multipoint EVC.
Answer: A,D
Explanation:
An Ethernet Private LAN (EPLAN) is a multipoint–to–multipoint EVC. EPLAN is an EVC that supports communication between two or more UNIs. In EPLAN, only one EVC can exist on a port and the port can have only one EFP.
Reference: https://www.cisco.com/c/en/us/td/docs/optical/cpt/r9_3/configuration/guide/cpt93_configurat ion/cpt93_configuration_chapter_0100.pdf
Q158. What is the ip dhcp snooping information option command used for?
A. It displays information about the DHCP snooping table.
B. It sends a syslog and an SNMP trap for a DHCP snooping violation.
C. It enables the DHCP snooping host tracking feature.
D. It enables DHCP option 82 data insertion.
Answer: D
Explanation:
To enable DHCP option-82 data insertion, perform this task:
Command
Purpose
Step 1
Router(config)# ip dhcp snooping information option
Enables DHCP option-82 data insertion.
Step 2
Router(config)# ip dhcp snooping information option replace
Or:
Router(config-if)# ip dhcp snooping information option replace
(Optional) Replaces the DHCP relay information option received in snooped packets with the switch's option-82 data.
Step 3
Router(config)# do show ip dhcp snooping | include 82
Verifies
Reference: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst6500/ios/12-2SX/configuration/guide/book/snoodhcp.html
Q159. Refer to the exhibit.
Which route type is displayed when you enter the command show ip route supernets-only on a device with this configuration?
A. Connected
B. OSPF
C. RIP
D. EIGRP
E. An empty route set
Answer: E
Explanation:
This command shows supernets only; it does not show subnets. In this case, the routing table would contain the 10.0.0.0/24 subnet, but not the 10.0.0.0/8 supernet.
Q160. Which two routing protocols are not directly supported by Cisco PfR route control, and rely on the Cisco PfR subfeature PIRO? (Choose two.)
A. BGP
B. EIGRP
C. Static routing
D. OSPF
E. IS-IS
Answer: D,E
Explanation:
Protocol Independent Route Optimization (PIRO) introduced the ability of Performance Routing (PfR) to search for a parent route—an exact matching route, or a less specific route—in the IP Routing Information Base (RIB), allowing PfR to be deployed in any IP-routed environment including Interior Gateway Protocols (IGPs) such as OSPF and IS-IS.
Reference: http://www.cisco.com/c/en/us/td/docs/ios/pfr/configuration/guide/15_1/pfr_15_1_book/pfr-piro.html