A network operator needs to implement PIM-SSM multicast configuration on a customer's network so that users in different domains are able to access and stream live traffic. Which two actions must the engineer perform on the network to make the streaming work? (Choose two.)
Answer(s): A,C
Which protocol is used for communication between the PCE and PCC?
Answer(s): C
A network engineer is configuring RIP as the routing protocol between multiple PEs and CEs. The engineer must avoid advertising the same routes back to their sources. Which action should be performed on the routers to accomplish this task?
Answer(s): A
A network engineer is deploying VPLS configuration between multiple PE routers so that customer's remote offices have end-to-end LAN connectivity. Which additional configuration should the engineer perform on the PE routers to enable the virtual switch instance?
The network-engineering team of a service provider is integrating several recently acquired networks into a more scalable common Unified MPLS architecture. The new network architecture will support end-to-end VPNv4 and VPNv6 services with these requirements:The IGP of the core layer is IS-IS in Area 0.The IGP of the aggregation layers is OSPF in Area 0.The LDP protocol is used to distribute label bindings within each IGP domain.Which task must the network engineer perform when implementing this new architecture?
Answer(s): D
A network engineer must enable multicast on the network to support a new series of webcasts. The PIM protocol has been enabled on the LAN side, with PIM and MSDP capabilities on edge router R1. The multicast source has been configured with IP address FF3A::121, and IP protocol 58 has been enabled and successfully tested in the network. Due to the limitations of some devices on the network, the data flow should take the most efficient path. Which task must the engineer perform to achieve the goal?
PIM-SSM (Protocol Independent Multicast - Source-Specific Multicast) provides the most efficient path for multicast data flow by eliminating the need for shared trees and Rendezvous Points (RPs). It allows receivers to explicitly request traffic from a specific source, such as the multicast source at IP address FF3A::121, using IGMPv3 or MLDv2. This ensures minimal overhead and the most direct routing for multicast traffic, meeting the requirement for efficient data flow while accommodating device limitations in the network.
How do PE routers operate with the MDT in a multicast VPN?
In a multicast VPN (MVPN), Multicast Distribution Trees (MDTs) are used to transport multicast traffic between PE routers. The default MDT is always active and is used for control traffic and low-bandwidth multicast traffic. When multicast traffic exceeds a certain bandwidth threshold, the sending PE router creates a data MDT for that specific multicast stream. It then sends a UDP message to notify other PE routers of the new data MDT using the default MDT. This optimizes multicast traffic flow by using dedicated data MDTs for high- bandwidth traffic, reducing unnecessary load on the default MDT.
A network engineer must implement an ACL-based solution to mitigate availability issues on a web service thatis hosted on a server at IP address 172.16.15.18/23. Access to the web server should be allowed over HTTP from RFC 1918 addresses only. The network architect has already enabled PMTUD in the network. Which ACL configuration must the engineer implement to complete the task?
The correct ACL ensures that:1. Fragmented packets destined for the web server are denied (deny ip any host 172.16.15.18 fragments) to avoid potential attack vectors that exploit fragmented traffic.2. Only HTTP traffic (TCP port 80) from RFC 1918 private IP ranges (10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16) is permitted to the web server at 172.16.15.18/23. This is achieved using permit 6 (protocol 6 for TCP) with the correct source and destination masks.3. All other traffic is denied by the final deny ip any any statement.This configuration aligns with the requirement to allow access to the web service over HTTP only from RFC 1918 addresses while denying any other traffic, including fragmented packets.
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