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An engineer is troubleshooting L3VPN traffic loss over the MPLS-enabled core network when new core links were enable. Assuming that the IGP is properly configured, which issue causes a temporary data flow blackholing when the IGP and LDP reconverges?
A. MPLS-TE tunnels without LDP adjacencies are used over the new links black-holing the traffic before the LDP label exchange is completed
B. MP-BGP sessions between PE and RR routers require extra time to reconverge than the underlying IGP
C. IP packets are forwarded as soon as routes are learned over a new IGP adjancey before the label exchange happens over the new links
D. LDP is a Layer 2 protocol forwarding Label packets before the IGP reconverged
Correct Answer: C
Which technology is a forwarding decision point in a PE router that provides flexibility to make many Layer 2 flow decisions within an interface?
D. local connect
Correct Answer: E
SNMPv3 provides which three security features?(Choose three)
A. DES 56-bit encryption
B. Encrypted user password
C. Private community information that is exchanged out-of-band
D. Device hostname that is authenticated via AES algorithm
E. Message integrity
F. Authentication that is based on MD5 or SHA algorithms
Correct Answer: AEF
Refer to the exhibit the 188.8.131.52/32 prefix is flapping when PE1 is flapping. Which action can fox this issue?
A. On PE2, allow only redistribution from BGP into IS-IS on PE3, allow only redistribution from IS-IS into BGP
B. On PE2 and PE3 reconfigure redistribute BGP into IS-IS using the metric-type external parameter
C. configure a sham link between PE2 and PE3
D. configure all IS-IS instances as level-1-only
Correct Answer: A
Which description of the Russian Doll Model is true?
A. RDM provides bandwidth sharing while providing bandwidth isolation and protection against QoS degradation, and also provides service differentiation for high-priority, normal- priority and best-effort priority services
B. RDM matches simple bandwidth control policies setting individual bandwidth constraint for a given class type and simultaneously limit the aggregate of reserved bandwidth across all class types
C. RDM can be used simultaneously to ensure bandwidth efficiency and to protect against QoS degradation of all class types, whether preemption is used or not
D. RDM guarantees a predefined amount of bandwidth for each type and at the same time allows the bandwidth sharing by defining two pools for every class type: private pool (guaranteed bandwidth) and common pool (bandwidth shared between all class types)
Correct Answer: C
Which are two benefits of using segment routing over RSVP-TE for traffic engineering? (Choose two)
A. Segment routing traffic engineering tunnels always follow the low-latency path
B. ECMP-aware traffic engineering is natively supported by segment routing
C. Per-flow state is present only at the ingress node to the Segment routing-enabled network
D. Per-flow state is present at the ingress and egress node to the segment routing-enabled network
E. Per-flow state is maintained on all nodes of the segment routing-enabled network
Correct Answer: BC
What is the main different between an SNMP trap and a syslog message?
A. SNMP traps are formally defined in a MIB, and syslog body contents are not formally defined
B. SNMP traps are forwarded to EMS systems and syslog messages are forwarded to any NMS system
C. SNMP traps are user-definable and vary based on vendor and syslog messages are standards-based
D. SNMP traps are secure, and syslog message are not
E. SNMP traps are triggered during network outages, and syslog messages are informational only
Correct Answer: A
Refer to the exhibit. The ITR map cache is empty. The ITR receives packet destined for 10.2.1.10 and it sends query to the MR. Which action does the MR/MS take after receive the query for 10.2.1.10?
A. The MR sends a map notify to the requesting ITR with address of 172.17.1.1 as the 10.2.1.0/24
B. The MR forwards the map request query to the ETR responsible for the EID 10.2.1.0/24
C. The MR forwards the map notify request to the ETR responsible for the EID 10.2.1.0/24
D. The MR sends a map reply to the requesting ITR with address of 172.17.1.1 as the for 10.2.1.0/24
Correct Answer: B
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
Correct Answer: D
An support engineer has been tasked to protect an ISP infrastructure from the growing number of encrypted DDoS attacks. The solution should also validate the eBGP peering. Which solution accomplishes these goals?
A. BGP FlowSpec
C. BGP Route Dampening
D. BGP LS
Correct Answer: B
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