Q1. Refer to the exhibit.
The NOC engineer noticed that the R2 router system clock is not updated and synchronized to the NTP server that is configured on the R10 router. What is the issue?
A. The access list NTP_Clients is missing.
B. The access group is misconfigured.
C. The maximum number of peers and client associations is exceeded.
D. The authentication key is mismatched.
E. The PE2 router should be configured as an NTP peer instead of as a client.
Answer: C
Q2. Which OSPF configuration suppresses the periodic OSPF hello packets?
A. router ospf 1
area0
interface GigabitEthernet 0/1
passive
B. router ospf 1
area0
interface GigabitEthernet 0/1
C. router ospf 1
area 0
interface GigabitEthernet 0/1
stub-router
router-lsa r-bit
D. router ospf 1
area 0
interface GigabitEthernet 0/1
demand-circuit
point-to-point
Answer: D
Q3. Refer to the exhibit:
A regional operations center recently set up a MPLS Inter-AS Option B solution for two service providers There is no intercommunication between CE1 and CE2 sites yet While troubleshooting this issue on the ASBR1 router, the operations engineer sees the following log:
BGP(4): 10.24.32.253 rcvd 100:101:40.72.97.0/24, label 136 -- DENIED due to: extended community not supported; What does this log mean?
A. The route-target value does not match the one in the local VRF
B. The community that was applied on ASBR 10.24.32.253 does not match the local policies
C. The bgp default route-target filter command is missing on both inter-AS ASBRs
D. The BGP command retain route-target all is missing
Answer: D
Q4. Which two statements about Unified MPLS are true? (Choose two.)
A. Unified MPLS works on Cisco IOS XR Software only.
B. Unified MPLS extends MPLS across multidomain networks in a scalable manner.
C. New technologies or protocols are not used; only MPLS, LDP, IGP, and BGP are used.
D. ABR loopback prefixes should always be redistributed from the core IGP into the aggregation IGP.
E. The RRs are part of the control path only.
Answer: B,D
Explanation: http://www.cisco.com/c/en/us/support/docs/multiprotocol-label-switching-mpls/mpls/116127-configure-technology-00.pdf
Q5. An engineer is working to provide high availability to a Service Provider core network. Which BGP command enables a backup path to be installed in the RIB and CEF tables?
A. maximum-paths ibgp
B. bgp additional-paths install
C. maximum-paths eibgp
D. bgp additional-paths select
E. bgp advertise-best-external
Answer: B
Explanation: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_bgp/configuration/xe-3s/irg-xe-3s-book/bgp_best_external.html#GUID-66F31B75-B1E6-4B38-9B4D-6A89839930CE
Q6. Which QoS method is available when GRE is used to provide MPLS VPN services over an IP-only core?
A. matching MPLS EXP on the physical interface
B. matching EXP on the tunnel interface
C. matching DSCP on the physical interface
D. matching DSCP on the tunnel interface
Answer: C
Q7. Which multicast feature listens multicast conversations maintaining a map in order to control which ports receive specific multicast traffic?
A. Bidirectional PIM
B. Source Specific Multicast
C. PIM assertion
D. IGMP snooping
Answer: D
Q8. The product team at an ISP that offers VoIP services wants to add two-way video conferencing to their product offering. Which three QoS methods can be applied for real-time traffic on WAN links with speeds that are slower than 768 Kbps? (Choose three.)
A. Apply MLP link fragmentation and interleaving to the interface.
B. Apply LLQ with both voice traffic and video traffic in the same priority queue.
C. Apply CBWFQ with VoIP traffic in its own class, which is marked with a PHB value of EF.
D. Apply CBWFQ with video traffic in its own class, which is marked with a PHB value of AF41.
E. Apply voice-adaptive fragmentation to ensure that large video packets are fragmented and interleaved.
F. Apply LLQ with video traffic that is dedicated in the priority queue.
Answer: A,C,D
Explanation:
http://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/WAN_and_MAN/QoS_SRND/Qo S-SRND-Book/WANQoS.html
Q9. Refer to the exhibit.
ISP-X customers must be able to reach both ISP-Y and ISP-Z, but ISP-X must not allow transit traffic between ISP-Y and ISP-Z at any time Which two options satisfy this requirement? (Choose two.)
A. Use the MED to prefer the proper routes
B. Use communities to identify and filter routes.
C. Use local preference to prefer the routes
D. Use a route map to filter routes on the AS number.
E. Use the atomic aggregate attribute
Answer: B,D
Q10. A Server Provider is seeing an increasing amount of attacks against its customers. For which kind of attack would an engineer want to design a Backscatter Traceback solution?
A. Rogue DNS/DHCP Servers
B. IP Spoofing
C. Ping of Death
D. Distributed Denial of Service
E. Network Attack TCP/UDP Scan
Answer: B
Explanation: Reference: http://www.cisco.com/web/about/security/intelligence/sp_infrastruct_scty.html
http://www.cisco.com/web/about/ac123/ac147/archived_issues/ipj_10-4/104_ip-spoofing.html