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Q151. Which technology is an application of MSDP, and provides load balancing and redundancy between the RPs?
A. static RP
B. PIM BSR
C. auto RP
D. anycast RP
Answer: D
Explanation:
Using Anycast RP is an implementation strategy that provides load sharing and redundancy in Protocol Independent Multicast sparse mode (PIM-SM) networks. Anycast RP allows two or more rendezvous points (RPs) to share the load for source registration and the ability to act as hot backup routers for each other. Multicast Source Discovery Protocol (MSDP) is the key protocol that makes Anycast RP possible.
Reference: www.cisco.com/c/en/us/td/docs/ios/solutions_docs/ip_multicast/White_papers/anycast.html
Q152. Which statement is true regarding UDLD and STP timers?
A. The UDLD message timer should be two times the STP forward delay to prevent loops.
B. UDLD and STP are unrelated features, and there is no relation between the timers.
C. The timers need to be synced by using the spanning-tree udld-sync command.
D. The timers should be set in such a way that UDLD is detected before the STP forward delay expires.
Answer: D
Explanation:
UDLD is designed to be a helper for STP. Therefore, UDLD should be able to detect an unidirectional link before STP would unblock the port due to missed BPDUs. Thus, when you configure UDLD timers, make sure your values are set so that unidirectional link is detected before “STP MaxAge + 2xForwardDelay” expires.
Reference: http://blog.ine.com/tag/stp/
Q153. Which statement about OSPF loop prevention is true?
A. The discard route is generated automatically on the ABR to prevent routing loops.
B. The ASBR uses type 3 LSAs from non-backbone areas to prevent control-plane routing loops.
C. The ABR can filter type 3 LSPs to prevent routing loops.
D. The DN bit ignores LSA types 2, 3, and 5 to prevent routing loops.
Answer: A
Q154. What is the purpose of EIGRP summary leaking?
A. to allow a summary to be advertised conditionally on specific criteria
B. to allow a component of a summary to be advertised in addition to the summary
C. to allow overlapping summaries to exist on a single interface
D. to modify the metric of the summary based on which components of the summary are operational
Answer: B
Explanation:
When you do manual summarization, and still you want to advertise some specific routes to the neighbor, you can do that using leak-map. Please read more about leaking routes here.
http://www.cisco.com/c/en/us/td/docs/ios/iproute_eigrp/command/reference/ire_book/ire_i1. html#wp1037685.
Q155. Which address is a MAC address that is mapped from an IPv6 address (RFC 2464)?
A. 3333.FF17.FC0F
B. FFFE. FF17.FC0F
C. FF34.3333.FF17
D. FF7E.FF17.FC0F
Answer: A
Explanation:
An IPv6 packet with a multicast destination address DST, consisting of the sixteen octets DST through DST, is transmitted to the Ethernet multicast address whose first two octets are the value 3333 hexadecimal and whose last four octets are the last four octets of DST.
Reference: https://tools.ietf.org/html/rfc2464
Q156. Which two statements about 6VPE are true? (Choose two.)
A. It allows a service provider to use an existing MPLS network to provide VPN services to IPv6 customers.
B. It uses MP-BGP as the carrier protocol to transport IPv6 connectivity.
C. It provides IPv6 connectivity to MPLS-VPN customers when IPv6 overlay tunneling is also configured.
D. It allows a service provider to use an existing MPLS network to provide global addressing to their IPv6 customers.
E. It requires the configuration of a GRE tunnel tagged with a VLAN ID.
F. It allows a service provider to use an existing L2TPv3 network to provide VPN services to IPv6 customers.
Answer: A,B
Explanation:
The IPv6 MPLS VPN service model is similar to that of IPv4 MPLS VPNs. Service providers who have already deployed MPLS IPv4 VPN services over an IPv4 backbone can deploy IPv6 MPLS VPN services over the same IPv4 backbone by upgrading the PE router IOS version and dual-stack configuration, without any change on the core routers. IPv4 services can be provided in parallel with IPv6 services. IPv6 VPN service is exactly the same as MPLS VPN for IPv4. 6VPE offers the same architectural features as MPLS VPN for IPv4. It offers IPv6 VPN and uses the same components, such as: .
Multiprotocol BGP (MP-BGP) VPN address family .
Route distinguishers .
VPN Routing and Forwarding (VRF) instances .
Site of Origin (SOO) .
Extended community .
MP-BGP
Reference: http://www.cisco.com/c/en/us/td/docs/net_mgmt/ip_solution_center/5-2/mpls_vpn/user/guide/mpls52book/ipv6.html
Q157. Which two statements are true about IS-IS? (Choose two.)
A. IS-IS DIS election is nondeterministic.
B. IS-IS SPF calculation is performed in three phases.
C. IS-IS works over the data link layer, which does not provide for fragmentation and reassembly.
D. IS-IS can never be routed beyond the immediate next hop.
Answer: C,D
Explanation:
IS-IS runs directly over the data link alongside IP. On Ethernet, IS-IS packets are always 802.3 frames, with LSAPs 0xFEFE while IP packets are either Ethernet II frames or SNAP frames identified with the protocol number 0x800. OSPF runs over IP as protocol number 89.
IS-IS runs directly over layer 2 and hence:
-cannot support virtual links unless some explicit tunneling is implemented
-packets are kept small so that they don't require hop-by-hop fragmentation
-uses ATM/SNAP encapsulation on ATM but there are hacks to make it use VcMux encapsulation
-some operating systems that support IP networking have been implemented to differentiate Layer 3 packets in kernel. Such Oss require a lot of kernel modifications to support IS-IS for IP routing.
-can never be routed beyond the immediate next hop and hence shielded from IP spoofing and similar Denial of Service attacks.
Reference: https://tools.ietf.org/html/draft-bhatia-manral-diff-isis-ospf-00
Q158. Which two features are used for inspection when IPv6 address glean is enabled? (Choose two.)
A. DHCP messages
B. ND messages
C. ICMPv6 messages
D. UDP messages
E. TCP messages
Answer: A,B
Explanation:
IPv6 address glean is the foundation for many other IPv6 features that depend on an accurate binding table. It inspects ND and DHCP messages on a link to glean addresses, and then populates the binding table with these addresses. This feature also enforces address ownership and limits the number of addresses any given node is allowed to claim.
Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipv6_fhsec/configuration/15-s/ip6f-15-s-book/ip6-snooping.html
Q159. Which two statements are true about IPv6 multicast? (Choose two.)
A. Receivers interested in IPv6 multicast traffic use IGMPv6 to signal their interest in the IPv6 multicast group.
B. The PIM router with the lowest IPv6 address becomes the DR for the LAN.
C. An IPv6 multicast address is an IPv6 address that has a prefix of FF00::/8.
D. The IPv6 all-routers multicast group is FF02:0:0:0:0:0:0:2.
Answer: C,D
Explanation:
Multicast addresses in IPv6 have the prefix ff00::/8.
Well-known IPv6 multicast addresses
Address
Description
ff02::1
All nodes on the local network segment
ff02::2
All routers on the local network segment
Reference: http://en.wikipedia.org/wiki/Multicast_address
Q160. DRAG DROP
Drag and drop the StackWise stack master election rule on the left into the correct priority order on the right.
Answer: