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Q1. Which technology is not necessary to set up a basic MPLS domain?
A. IP addressing
B. an IGP
C. LDP or TDP
D. CEF
E. a VRF
Answer: E
Explanation:
The simplest form of VRF implementation is VRF Lite. In this implementation, each router within the network participates in the virtual routing environment in a peer-based fashion. While simple to deploy and appropriate for small to medium enterprises and shared data centres, VRF Lite does not scale to the size required by global enterprises or large carriers, as there is the need to implement each VRF instance on every router, including intermediate routers. VRFs were initially introduced in combination with MPLS, but VRF proved to be so useful that it eventually evolved to live independent of MPLS. This is the historical explanation of the term VRF Lite. Usage of VRFs without MPLS.
Reference: http://en.wikipedia.org/wiki/Virtual_routing_and_forwarding
Q2. On a broadcast interface, which two OSPF states support BFD sessions? (Choose two.)
A. DR
B. BDR
C. DROTHER
D. 2WAY
E. FULL
F. ACTIVE
Answer: A,B
Q3. Which two statements about the BGP community attribute are true? (Choose two.)
A. Routers send the community attribute to all BGP neighbors automatically.
B. A router can change a received community attribute before advertising it to peers.
C. It is a well-known, discretionary BGP attribute.
D. It is an optional transitive BGP attribute.
E. A prefix can support only one community attribute.
Answer: B,D
Explanation:
A community is a group of prefixes that share some common property and can be configured with the BGP community attribute. The BGP Community attribute is an optional transitive attribute of variable length. The attribute consists of a set of four octet values that specify a community. The community attribute values are encoded with an Autonomous System (AS) number in the first two octets, with the remaining two octets defined by the AS. A prefix can have more than one community attribute. A BGP speaker that sees multiple community attributes in a prefix can act based on one, some or all the attributes. A router has the option to add or modify a community attribute before the router passes the attribute on to other peers.
Reference:
http://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/28784-bgp-community.html
Q4. You are backing up a server with a 1 Gbps link and a latency of 2 ms. Which two statements about the backup are true? (Choose two.)
A. The bandwidth delay product is 2 Mb.
B. The default TCP send window size is the limiting factor.
C. The default TCP receive window size is the limiting factor.
D. The bandwidth delay product is 500 Mb.
E. The bandwidth delay product is 50 Mb.
Answer: A,C
Explanation:
1 Gbps is the same as 1000 Mbps, and 1000Mb x .0002 = 2 Mbps. With TCP based data transfers, the receive window is always the limiting factor, as the sender is generally able to send traffic at line rate, but then must wait for the acknowledgements to send more data.
Q5. Which two statements about OSPF default route injection are true? (Choose two.)
A. The ABR requires manual configuration to send a default route into an NSSA area.
B. The ABR injects a default route into a Totally Stub Area.
C. In a stub area, the ASBR generates a summary LSA with link-state ID 0.0.0.0.
D. If the default route is missing from the routing table, the ASBR can use the default-information originate command to advertise the default into the OSPF domain.
E. By default, OSPF normal areas will generate default routes into the routing domain if a default route exists.
Answer: A,B
Q6. Which three statements about RIP timers are true? (Choose three.)
A. The default update timer is 30 seconds.
B. The default invalid timer is 180 seconds.
C. The default holddown timer is 180 seconds.
D. The default flush timer is 60 seconds.
E. The default scan timer is 60 seconds.
F. The default hello timer is 5 seconds.
Answer: A,B,C
Explanation:
The routing information protocol uses the following timers as part of its operation:
Update Timer
Invalid Timer
Flush Timer
Holddown Timer
Update Timer
The update timer controls the interval between two gratuitous Response Message. By default the value is 30 seconds. The response message is broadcast to all its RIP enabled interface.
Invalid Timer
The invalid timer specifies how long a routing entry can be in the routing table without being updated. This is also called as expiration Timer. By default, the value is 180 seconds. After the timer expires the hop count of the routing entry will be set to 16, marking the destination as unreachable.
Flush Timer
The flush timer controls the time between the route is invalidated or marked as unreachable and removal of entry from the routing table. By default the value is 240 seconds. This is 60 seconds longer than Invalid timer. So for 60 seconds the router will be advertising about this unreachable route to all its neighbors. This timer must be set to a higher value than the invalid timer.
Hold-down Timer
The hold-down timer is started per route entry, when the hop count is changing from lower value to higher value. This allows the route to get stabilized. During this time no update can be done to that routing entry. This is not part of the RFC 1058. This is Cisco's implementation. The default value of this timer is 180 seconds.
Reference: http://en.wikipedia.org/wiki/Routing_Information_Protocol#Timers
Q7. DRAG DROP
Drag and drop the multiprotocol BGP feature on the left to the corresponding description on the right.
Answer:
Q8. Refer to the exhibit.
Two multicast domains are configured as shown and connected with MSDP, but the two
domains are unable to communicate. Which two actions can you take to correct the problem? (Choose two.)
A. Change the peering IP address in AS 65220 to 10.0.0.20.
B. Change the peering AS on R2 to 65210.
C. Verify that UDP port 639 is open.
D. Verify that TCP port 139 is open.
E. Change the MSDP originator-id to GigabitEthernet 0/0/0 on both routers.
F. Change the MSDP peering IP address on R2 to 172.16.1.13.
Answer: A,B
Q9. Which two statements about LDP advertising when Explicit Null is in effect are true? (Choose two.)
A. Penultimate hop popping is disabled.
B. Penultimate hop popping is enabled.
C. It is the default behavior for LDP.
D. It is used for the advertisement of static routes.
E. It is used for the advertisement of connected routes.
Answer: A,E
Q10. DRAG DROP
Drag and drop the router preference on the left to the correct routing sequence (from most preferred to least preferred) on the right.
Answer:
Q11. Refer to the exhibit.
You are configuring the S1 switch for the switchport connecting to the client computer. Which option describes the effect of the command mls qos map cos-dscp 0 8 16 24 32 40 46 56?
A. Voice traffic is excluded from the default priority queue.
B. Voice packets are given a class selector of 5.
C. Video conferencing is marked CS3.
D. Voice packets are processed in the priority queue.
Answer: A
Explanation:
The default CoS to DSCP mappings are shown below:
Default CoS-to-DSCP Map
CoS Value
DSCP Value
0
0
1
8
2
16
3
24
4
32
5
40
6
48
7
56
In our example, we see that COS 6 is mapped to DSCP, not the default of DSCP 48 as shown above. DSCP 46 is Expedited Forwarding (EF), which is typically used for voice traffic, and this value has not been included in this class map.
Q12. Which option is the default number of routes over which EIGRP can load balance?
A. 1
B. 4
C. 8
D. 16
Answer: B
Explanation:
By default, EIGRP load-shares over four equal-cost paths. For load sharing to happen, the routes to load-share over must show up in the IP forwarding table or with the show ip route command. Only when a route shows up in the forwarding table with multiple paths to it will load sharing occur.
Reference: http://www.informit.com/library/content.aspx?b=CCIE_Practical_Studies_I&seqNum=126
Q13. Refer to the exhibit.
Routers R1, R2, and R3 are configured as shown, and traffic from R2 fails to reach 172.29.168.3.
Which action can you take to correct the problem?
A. Correct the static route on R1.
B. Correct the default route on R2.
C. Edit the EIGRP configuration of R3 to enable auto-summary.
D. Correct the network statement for 172.29.168.3 on R3.
Answer: A
Explanation:
On R1 we see there is a wrongly configured static route: ip route 172.29.168.3 255.255.255.255 172.17.17.2. It should be ip route 172.29.168.3 255.255.255.255 10.17.12.3.
Q14. Which two BGP attributes are optional, non-transitive attributes? (Choose two.)
A. AS path
B. local preference
C. MED
D. weight
E. cluster list
Answer: C,E
Q15. DRAG DROP
Drag and drop the LACP elements on the left into the correct priority order in the hot-standby port-selection process on the right.
Answer: