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Company XYZ network runs IPv4 and IPv6 and they want to introduce a multidomain, multicast-based network. The new design should use a flavor of PIM that forwards traffic using SPT. Which technology meets this requirement?

  1. PIM-SSM
  2. PIM-SM
  3. BIDIR-PIM
  4. PIM-DM

Answer(s): A

Explanation:

PIM source-specific multicast (SSM) uses a subset of PIM sparse mode and IGMP version 3 (IGMPv3) to allow a client to receive multicast traffic directly from the source. PIM SSM uses the PIM sparse-mode functionality to create an SPT between the receiver and the source, but builds the SPT without the help of an RP.

IPv6 multicast provides support for intradomain (not interdomain) multicast routing using PIM sparse mode (PIM-SM). PIM-SM uses unicast routing to provide reverse-path information for multicast tree building, but it is not dependent on any particular unicast routing protocol.



Company XYZ has 30 sites running a legacy private WAN architecture that connects to the Internet via multiple high-speed connections. The company is now redesigning their network and must comply with these design requirements:

•Use a private WAN strategy that allows the sites to connect to each other directly and caters for future expansion
•Use the Internet as the underlay for the private WAN
•Securely transfer the corporate data over the private WAN

Which two technologies should be incorporated into the design of this network? (Choose two.)

  1. PPTP
  2. DMVPN
  3. IPsec
  4. GET VPN
  5. S-VTI

Answer(s): B,C

Explanation:

Internet as underlay, GETVPN is not an option due to IP header preservation.


Reference:

GETVPN does not support internet overlay due to IP header preservation
https://ipwithease.com/getvpn-vs-dmvpn/





Refer to the exhibit. An engineer is designing the traffic flow for AS 111. Traffic from AS 111 should be preferred via AS 100 for all external routes. A method must be used that only affects AS 111. Which BGP attributes are best suited to control outbound traffic?

  1. MED
  2. community
  3. local preference
  4. AS path

Answer(s): C



Which BGP feature provides fast convergence?

  1. BGP-LS
  2. BGP FlowSpec
  3. BGP-EVPN
  4. BGP PIC

Answer(s): D

Explanation:

BGP PIC (BGP Policy Installed Constraints) is a feature that allows BGP to quickly converge in the event of a topology change. BGP PIC does this by pre-installing policy constraints on BGP routes. This means that when a topology change occurs, BGP only needs to update the policy constraints, rather than the entire routing table.

The other options are not as effective for providing fast convergence. Option A, BGP-LS, is a feature that allows BGP to exchange link-state information. However, BGP-LS does not provide any specific functionality for improving convergence. Option B, BGP FlowSpec, is a feature that allows BGP to control the forwarding of traffic based on flow information. However, BGP FlowSpec does not provide any specific functionality for improving convergence. Option C, BGP-EVPN, is a feature that allows BGP to exchange Ethernet VPN (EVPN) information. However, BGP-EVPN does not provide any specific functionality for improving convergence.


Reference:

https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_bgp/configuration/xe-3s/asr903/17-1-1/b-irg-xe-17-1-asr903/b-irg-xe-17-1-asr903_chapter_01.pdf






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