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Q1. Which regular expression will only allow prefixes that originated from AS 65000 and that are learned through AS 65001?
A. ^65000_65001$
B. 65000_65001$
C. ^65000_65001
D. ^65001_65000$
Answer: D
Explanation:
The following table lists the regular expressions and their meanings:
+------------------------------------------------------+
| CHAR | USAGE |
+------------------------------------------------------|
| ^ | Start of string |
|------|-----------------------------------------------|
| $ | End of string |
|------|-----------------------------------------------|
| [] | Range of characters |
|------|-----------------------------------------------|
| - | Used to specify range ( i.e. [0-9] ) |
|------|-----------------------------------------------|
| ( ) | Logical grouping |
|------|-----------------------------------------------|
| . | Any single character |
|------|-----------------------------------------------|
| * | Zero or more instances |
|------|-----------------------------------------------|
| + | One or more instance |
|------|-----------------------------------------------|
| ? | Zero or one instance |
|------|-----------------------------------------------|
| _ | Comma, open or close brace, open or close |
| | parentheses, start or end of string, or space |
+------------------------------------------------------+
Some commonly used regular expressions include:
+-------------+---------------------------+
| Expression | Meaning |
|-------------+---------------------------|
| .* | Anything |
|-------------+---------------------------|
| ^$ | Locally originated routes |
|-------------+---------------------------|
| ^100_ | Learned from AS 100 |
|-------------+---------------------------|
| _100$ | Originated in AS 100 |
|-------------+---------------------------|
| _100_ | Any instance of AS 100 |
|-------------+---------------------------|
| ^[0-9]+$ | Directly connected ASes |
+-------------+---------------------------+
Reference: http://blog.ine.com/2008/01/06/understanding-bgp-regular-expressions/
Q2. Refer to the exhibit.
For which reason could a BGP-speaking device in autonomous system 65534 be prevented from installing the given route in its BGP table?
A. The AS number of the BGP is specified in the given AS_PATH.
B. The origin of the given route is unknown.
C. BGP is designed only for publicly routed addresses.
D. The AS_PATH for the specified prefix exceeds the maximum number of ASs allowed.
E. BGP does not allow the AS number 65535.
Answer: A
Explanation:
BGP is considered to be a 'Path Vector' routing protocol rather than a distance vector routing protocol since it utilises a list of AS numbers to describe the path that a packet should take. This list is called the AS_PATH. Loops are prevented because if a BGP speaking router sees it's own AS in the AS_PATH of a route it rejects the route.
Q3. Which two statements about the function of PIM designated router are true? (Choose two.)
A. It registers directly connected source to the PIM rendezvous point.
B. It sends PIM asserts on the interface of the outgoing interface list.
C. It sends PIM Join/Prune messages for directly connected receivers.
D. It forwards multicast traffic from the source into the PIM network.
E. It sends IGMP queries.
Answer: A,C
Q4. Which three EIGRP packet types are valid? (Choose three.)
A. open
B. notification
C. keep-alive
D. hello
E. query
F. reply
Answer: D,E,F
Explanation:
EIGRP uses the following packet types: hello and acknowledgment, update, and query and reply.
Hello packets are multicast for neighbor discovery/recovery and do not require acknowledgment. An acknowledgment packet is a hello packet that has no data. Acknowledgment packets contain a nonzero acknowledgment number and always are sent by using a unicast address.
Update packets are used to convey reachability of destinations. When a new neighbor is discovered, unicast update packets are sent so that the neighbor can build up its topology table. In other cases, such as a link-cost change, updates are multicast. Updates always are transmitted reliably.
Query and reply packets are sent when a destination has no feasible successors. Query packets are always multicast. Reply packets are sent in response to query packets to instruct the originator not to recompute the route because feasible successors exist. Reply packets are unicast to the originator of the query. Both query and reply packets are transmitted reliably.
Reference: http://docwiki.cisco.com/wiki/Enhanced_Interior_Gateway_Routing_Protocol
Q5. Refer to the exhibit.
Which statement is true?
A. R2 is directly connected to the receiver for this group and is the winner of an assert mechanism.
B. R2 is directly connected to the receiver for this group, and it forwards the traffic onto Ethernet3/0, but it is forwarding duplicate traffic onto Ethernet3/0.
C. R2 has the A flag (Accept flag) set on Ethernet 3/0. This is fine, since the group is in BIDIR-PIM mode.
D. R2 is directly connected to the receiver for this group and is the loser of an assert mechanism.
E. The A flag is set until the SPT threshold is reached for this multicast group.
Answer: A
Explanation:
show ip mroute Field Descriptions
Field
Description
RPF neighbor or RPF nbr
IP address of the upstream router to the source. Tunneling indicates that this router is sending data to the RP encapsulated in register packets. The hexadecimal number in parentheses indicates to which RP it is registering. Each bit indicates a different RP if multiple RPs per group are used. If an asterisk (*) appears after the IP address in this field, the RPF neighbor has been learned through an assert.
Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_2/ipmulti/command/reference/fiprmc_r/1rfmult 3.html
Q6. Refer to the exhibit.
Which two statements about this route table are true? (Choose two.)
A. The BGP routes are internal.
B. The OSPF routes with the E2 flag retain the same metric as they leave the router.
C. The OSPF routes with the IA flag have their administrative distances incremented as they leave the router.
D. The BGP routes are external.
E. The OSPF routes with the E2 flag have their metrics incremented as they leave the router.
Answer: A,B
Explanation:
IBGP routes have an Administrative distance of 200, while EBGP have an AD of 20. Here we see that the BGP routes have an AD value of 200.
With OSPF, external routes fall under two categories, external type 1 and external type 2.
The difference between the two is in the way the cost (metric) of the route is being calculated. The cost of a type 2 route is always the external cost, irrespective of the interior cost to reach that route. A type 1 cost is the addition of the external cost and the internal cost used to reach that route. The metric for E2 routes do not change when advertising to other routers.
Q7. Refer to the exhibit.
The two standalone chassis are unable to convert into a VSS. What can you do to correct the problem?
A. Set a different port channel number on each chassis.
B. Set a different virtual domain ID on each chassis.
C. Set the redundancy mode to rpr on both chassis.
D. Add two ports to the port channel group.
Answer: A
Q8. In the DiffServ model, which class represents the lowest priority with the lowest drop probability?
A. AF11
B. AF13
C. AF41
D. AF43
Answer: A
Explanation:
Assured Forwarding (AF) Behavior Group
Class 1
Class 2
Class 3
Class 4
Low Drop
AF11 (DSCP 10)
AF21 (DSCP 18)
AF31 (DSCP 26)
AF41 (DSCP 34)
Med Drop
AF12 (DSCP 12)
AF22 (DSCP 20)
AF32 (DSCP 28)
AF42 (DSCP 36)
High Drop
AF13 (DSCP 14)
AF23 (DSCP 22)
AF33 (DSCP 30)
AF43 (DSCP 38)
Reference: http://en.wikipedia.org/wiki/Differentiated_services
Q9. Refer to the exhibit.
You are configuring the S1 switch for the switch port that connects to the client computer. Which configuration blocks users on the port from using more than 6 Mbps of traffic and marks the traffic for a class of service of 1?
A)
B)
C)
D)
A. Exhibit A
B. Exhibit B
C. Exhibit C
D. Exhibit D
Answer: A
Explanation:
Only option A specified that the exceed and violate actions are set to drop for traffic over the CIR of 6 Mbps, and is also configured to set all traffic with a COS of 1 using the “set cos1” command.
Q10. Refer to the exhibit.
Which two statements about the R1 configuration are true? (Choose two.)
A. The IP TTL value is copied to the MPLS field during label imposition.
B. The structure of the MLPS network is hidden in a traceroute.
C. The LDP session interval and hold times are configured for directly connected neighbors.
D. R1 protects the session for 86400 seconds.
E. All locally assigned labels are discarded.
Answer: B,D