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Total 313 questions
Which protocol provides an alternative to the STP, which provides a way to control network loops, handle link failures, and improve convergence time and can coexist with STP?
- A. IEEE 802.1ah
- B. Flex Links
- C. E-TREE
- D. PBB-EVPN
- E. REP
Answer : E
References:
Which three configuration sections are required on service provider PE routers to enable IPv4 Layer 3 VPN? (Choose three.)
- A. Implement MPLSfor all customer-facing links.
- B. Configure route targets that are used for importing and exporting customer VRF routers.
- C. Advertise customer routes to all PE routers by configuring the IPv4 address-family under the MP-BGP configuration mode.
- D. Configure at least one interface that is assigned to a customer link as a member of the VRF
- E. Configure the VPNv4 address-family under the MP-BGP configuration mode on the PE routers that participate in the customer VRF routing
- F. Configure route distinguishers that are used for importing and exporting customer VRF routes
Answer : BDE
Explanation:
A VPLS network consists of provider edge routers that have fully meshed pseudowires. The network runs unicast and multicast traffic. The network recently experienced bandwidth- and CPU-related performance issues. While monitoring the VPLS statistics and interface statistics, you note that the network is experiencing an unusual amount of broadcasts and undesired multicast on the network. Which two techniques should the operations team consider in addressing these problems?
- A. Implement IGMP snooping in the VPLS network.
- B. Enable split horizon between all the pseudowires in the VPLS network
- C. Set a limit on MAC learning in the VPLS network
- D. Implement Storm Control in the VPLS bridge domain
- E. Implement MAC withdrawal on each EFP I the VPLS bridge domain
- F. Change the network to run VPWS to manage the broadcast traffic efficiently
Answer : AD
Explanation:
In an inter-AS L3VPN Option B, the PE-ASBRs use which routing table to store all the VPN routes that needs to be exchanged?
- A. BGP table
- B. VRF routing table
- C. global routing table
- D. IGP table
Answer : A
References:
Refer to the exhibit. IPTV video clients are connected to R6. Unicast and multicast traffic flows from R1 to R6. The OSPF cost of the R1-R2-R3-R6 path is lower than the R1-R5-R4-R3-R6 path.
To enable load sharing and fast reroute, the design team decided to implement MPLS TE tunnels between R1 and R3. After the MPLS TE tunnels are deployed, the multicast traffic stops working.
While troubleshooting the issue, the operations engineer noticed that the OSPF route to the multicast source is learned via the MPLS TE tunnel, which causes the
RPF check to fail. Which two solutions can prevent the multicast traffic from being affected by the RPF check failure due to the MPLS TE tunnel deployment?
(Choose two.)
- A. Enable the multitopology routing feature
- B. Enable the multicast-intact feature.
- C. Enable PIM on the MPLS TE tunnel towards the receiver.
- D. Create a static mroute on R3 with the RPF pointing to the MPLS TE tunnel.
- E. Enable the forwarding adjacency feature instead of autoroute announce feature.
Answer : BD
Explanation:
A service provider NOC engineer received numerous support tickets from their VPN customers. These customers are reporting packet loss between two PE routers. The NOC engineer created a VRF TEMP to run tests between these two PE routers, and no errors were reported. ECMP links are used between P and
PE routers.
Which test can quickly identify the core link that is causing the problems?
- A. an extended traceroute with multipath option between the PE"™s loopbacks
- B. anmpls traceroute with multipath option between the PE"™s loopbacks
- C. anmpls ping with sweep option between the PE"™s loopbacks
- D. avrf ping between customer"™s CE router and service provider"™s remote PE router
- E. an extended ping with sweep option between the PE"™s loopbacks
- F. avrf traceroute between customer"™s CE router and service provider"™s remote PE router
Answer : B
Explanation:
DRAG DROP -
Drag and drop the MPLS Inter-AS VPN options on the left onto the correct description on the right.
Select and Place:
Answer :
Refer to the exhibit. A company has four office locations, which are identified as 1, 2, 3 and 4. The PE routers at these locations have assigned RDs of 10:10,
20:20, 30:30, and 40:40, respectively. Locations 1 and 3 need to share routing information, which configuration will allow this?
- A. Site 1vrf definition ACMEroute-target import 15:15Site 3vrf definition ACMEroute-target import 15:15
- B. Site 1vrf definition ACMEroute-target import 20:20route-target import 30:30route-target import 40:40
- C. Site 1vrf definition ACMEroute-target import 30:30Site 3vrf definition ACMEroute-target import 10:10
- D. Site 1vrf definition ACMEroute-target import 15:15Site 3vrf definition ACMEroute-target import 15:15
- E. Site 3vrf definition ACMEroute-target import 10:20route-target import 20:30route-target import 40:40
Answer : C
Explanation:
In Multicast Inter-AS VPN context that are based in the first MVPN generation, which BGP attribute overcome the option B limitation due to a rewritten originator next-hop address in the network?
- A. AS path
- B. weight
- C. originator
- D. connector
Answer : D
References:
DRAG DROP -
Refer to exhibit. PE1 and PE2 has a Layer 2 VPN over a GRE tunnel. The GRE tunnel built between P1 and P2 has LDP enabled. Consider a packet capture of the packets from CE1 and CE2 at P1 and R1 link. Drag and drop the headers on the left onto the correct order of the encapsulation on the right, starting from the inner header (at the top) to the outer header (at the bottom).
Select and Place:
Answer :
Which are the two limitations of the predefined NAT solution? (Choose two.)
- A. Only the port-presentation option is available.
- B. It cannot be configured for each of the inside VRF instance.
- C. The global port limit parameter is not available for the predefined mode.
- D. The Bulk Port Allocation configuration is not available.
- E. NetFlow and syslog are not supported.
Answer : CD
References:
Refer to the exhibit. All PE routers are configured with full-mesh MP-BGP and VPNv4 routing to provide L3VPN services. A central services VRF is implemented, to provide management and monitoring products to customers with dedicated VRFs. The objective of this design is to provide routing between the central services
VRF and VRFs A and B. Which Implementation achieves this goal?
- A. PE1#vrf definition Ard 400:1address-family ipv4route-target export 1001:1PE2#vrf definition Brd 500:1address-familyipv4route-target export 1001:1PE3#vrf definition SERVICESrd 1001:1address-family ipv4route-target export 400:1route-target export 500:1
- B. PE1#vrf definition Ard 400:1address-family ipv4route-target export 400:1route-target export 1001:1PE2#vrf definition Brd 500:1address-family ipv4route-target export 500:1route-target export 1001:1PE3#vrf definition SERVICESrd 1001:1address-family ipv4route-target export 400:1route-target export 500:1
- C. PE1#vrf definition Ard 400:1address-family ipv4route-target import 1001:1PE2#vrf definition Brd 500:1address-family ipv4route-target import 1001:1PE3#vrf definition SERVICESrd 1001:1address-family ipv4route-target export 400:1route-target export 500:1
Answer : B
Explanation:
In the Dual Stack Lite solution, what is the function of the B4 component?
- A. It acts as an endpoint for the IPv6 in IPv4 encapsulation and forwarding.
- B. It reverses network address translated of the IPv4 packets coming from the Internet and it sends the resultant IPv4 packets to AFTR
- C. It decapsulates the tunneled IPv4 packets, translates the network address, and routes to the IPv4 network
- D. It encapsulates the customer IPv4 packets using an IPv6 tunnel and sends to the AFTR
Answer : D
References:
Refer to the exhibit. The Service Provider is deploying Internet service to its VRF customers by using vrf INTERNET. A dedicated firewall provides NAT functionally towards the Internet. Assume that IP address overlapping between VRFs is not an issue.
Which three configuration steps are required to add Internet service to the VRF customers? (Choose three.)
- A. Export the RD ofvrf INTERNETfrom all customer VRFs.
- B. Import theRD fromvrf INTERNETin all customer VRFs.
- C. C.Leak all VRF routes to the global routing table.
- D. Originate a default route on PE4 invrf INTERNET.
- E. Originate a default route on the firewall invrf INTERNET.
- F. Import the VRF "INTERNET" Route Target in all customer VRFs.
- G. Import the Route Target of all customer VRFs invrf INTERNET.
Answer : BCD
Explanation:
Which Cisco IOS XR configuration creates an L2VPN using BGP as auto discovery and LDP as signaling?
- A. l2vpnbridge group bg1bridge-domain bg1_bd1interface gig0/6/0/1.1!vfi bg1_db1_vfivpn-id 101autodiscovery bgprd 101:1route-target 101:1signaling-protocol ldpvpls-id 1:101
- B. l2vpnbridge group bg1bridge-domain bg1_bd1interface gig0/6/0/1.123!vfi bg1_db1_vfivpn-id 123autodiscovery bgprd 123:3route-target 123:3signaling-protocol bgpve-id 3
- C. l2vpnbridge group bg1bridge-domain bg1_bd1interface gig0/6/0/1.1!vfi bg1_db1_vfivpn-id 111autodiscovery bgprd autoroute-target 111:1signaling-protocol bgpve-id 3
- D. l2vpnbridge group bg1bridge-domain bg1_bd1interface gig0/6/0/1.1!vfi bg1_db1_vfivpn-id 111autodiscovery bgprd autoroute-target autosignaling-protocol bgpvpls-id auto
Answer : A
References:
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