Refer to the exhibit. A network engineer is configuring Ethernet Layer 2 service to connect CE2 and CE3 for video and data application sharing with these requirements:A point-to-point cross-connect services must be established between 10.10.10.10 and 20.20.20.20.PE1 and PE2 must learn neighbors dynamically in PW 10.Which configuration must be implemented on PE1 to meet the requirements?
Answer(s): B
To establish a point-to-point (P2P) Layer 2 VPN service, you need to configure a Virtual Circuit (VC) using xconnect on PE1 that links the GigabitEthernet interface to its neighbor's corresponding interface. Here's how this configuration satisfies the requirements:1. l2vpn xconnect group: Defines the Layer 2 VPN context under which the P2P connection is configured.2. p2p XCON1_PE1PE2: Specifies the P2P connection identifier for the VC.3. interface GigE: Maps the local interface to be part of the P2P cross-connect.4. neighbor 20.20.20.20: Specifies the remote PE router's IP address that participates in the VC.5. pw-id 10: Assigns the pseudowire ID, enabling the dynamic discovery of the neighbor for the Layer 2 cross-connect.This configuration achieves the requirement to dynamically learn neighbors in Pseudowire (PW) 10 and establishes the desired P2P Ethernet service between CE2 and CE3.
A network architect at ISP_A must implement a loop-avoidance mechanism in the organization's ring network topology. The architect decided to implement ITU-T G.8032. Intermittent link flaps within two seconds should be ignored. Which two configurations must the architect apply? (Choose two.)
Answer(s): B,E
ring-protection g8032 profile vlan port-channel none: This command ensures the correct configuration of the ITU-T G.8032 Ethernet Ring Protection Switching (ERPS) protocol by defining the VLAN and port-channel settings required for the ring protection mechanism.timer hold-off 2: The hold-off timer prevents the protocol from reacting to brief link flaps by ignoring changes for a specified duration (in this case, 2 seconds). This reduces the impact of transient failures on the stability of the network.These configurations are critical for implementing loop avoidance using the G.8032 protocol while ensuring stability in the presence of short-lived link flaps.
Refer to the exhibit. Router R1 in the network has a GigabitEthernet interface supporting 1 Gbps of bandwidth, and R2 has a FastEthernet interface. Both devices are connected to a WAN network as shown. To ensure seamless data flow, both routers have BGP routing enabled with the WAN ISP. To better handle a recent increase in VoIP traffic, a network engineer must identify VoIP traffic and mark it with DSCP value EF to guarantee bandwidth of 500 Kbps. Which action must the engineer take to meet the requirements?
Answer(s): D
To ensure quality for VoIP traffic, which is latency-sensitive, the engineer must implement traffic policing to control the rate of traffic flow and ensure it does not exceed the allocated bandwidth. By marking VoIP traffic with DSCP value EF (Expedited Forwarding) and enforcing a 500 Kbps bandwidth guarantee, the network prioritizes VoIP traffic while maintaining efficient use of available bandwidth.
A mid-size service provider uses L2VPN as its standard for connectivity between offices. A small company wants the service provider to connect the company's two sites across the service provider core. To meet service requirements, the service provider must extend the Layer 2 domain between the company's two locations. Which configuration must the engineer apply to implement an attachment circuit between the two sites using a VLAN tag of 12?
For connecting the two sites across the service provider core and extending the Layer 2 domain, the service provider needs to configure an attachment circuit with the specified VLAN tag (12). The configuration includes:interface TenGigE0/0/0/1.0 l2transport: Sets up the interface for Layer 2 transport mode.encapsulation dot1q 12: Configures the VLAN tag (12) for the attachment circuit, ensuring that theLayer 2 traffic is properly encapsulated and forwarded across the provider's MPLS core.
Refer to the exhibit. Company A's network architect is implementing the capabilities that are described in RFC 4379 to provide new options for troubleshooting the company's MPLS network. MPLS LSPs are signaled via the BGP routing protocol with IPv4 unicast prefix FECs. Due to company security policies, access is controlled on the control plane and management plane. Which two tasks must the architect perform to achieve the goal? (Choose two.)
Answer(s): C,E
Open UDP port 3503:MPLS Operations, Administration, and Maintenance (OAM), as defined in RFC 4379, uses UDP port 3503 for MPLS LSP Ping and Traceroute messages. Opening this port ensures that LSP Ping packets can traverse the network for troubleshooting purposes.Implement LSP Ping on PE routers only:LSP Ping is used to verify the forwarding of MPLS LSPs and is typically implemented on PE routers, as they are responsible for establishing and maintaining MPLS LSPs for customer traffic. This allows effective troubleshooting without requiring implementation on every core router.
Refer to the exhibit. A network engineer must enable multicast in the network in support of a new business initiative to launch multicast-based company TV. The multicast source is connected to Layer 3 switch SW_1 with an IP address of 172.16.12.1. ip multicast-routing has been configured on SW_1, and CoPP policies across the LAN segment have been adjusted to allow IP protocol number 103. All hosts in the network should receive the TV flow, but they should be permitted to prune themselves from the flow. Which task must the engineer perform to achieve the goal?
Answer(s): C
PIM Dense Mode (PIM-DM) is suitable for scenarios where multicast traffic needs to be sent to all devices in a network, with devices able to prune themselves if they don't want the multicast stream. This behavior aligns with the requirement that "all hosts in the network should receive the TV flow, but they should be permitted to prune themselves from the flow."PIM-DM floods multicast traffic to all routers and then allows non-interested routers to send prune messages, reducing unnecessary traffic.
A company uses PIM-SM multicast with IGMPv2 to stream training videos from a server in one network to hosts in a different network. As the company has grown, the networking team decided to Implement SSM to improve efficiency for multicast within Layer 2. Which action must the team take to begin the process?
Source-Specific Multicast (SSM) improves multicast efficiency by enabling receivers to specify both the multicast group and the source they want to receive traffic from. This eliminates the need for shared trees and Rendezvous Points (RPs), optimizing multicast traffic delivery. IGMPv3 is required for SSM as it supports source filtering, allowing hosts to request traffic from specific sources.To enable SSM:IGMPv3 must be implemented on the network, as IGMPv2 does not support the source-specific functionalityrequired for SSM.Deprecating IGMPv2 ensures all devices use IGMPv3, avoiding compatibility issues and enabling SSM-capable multicast streams.
Refer to the exhibit. R1 and R3 have a pseudowire connection between them, which allows R2 and R4 to communicate via Layer 2. R2 uses VLAN 10. R4 also uses VLAN 10, but with a different subnet associated. Which configuration should the engineer apply to R3 to rewrite the VLAN on traffic from R2 to VLAN 15?
To rewrite VLAN tags between R2 and R4 across the pseudowire, the configuration should:1. Set the encapsulation to VLAN 10 (encapsulation dot1q 10) on the interface where traffic is received from R2.2. Rewrite the ingress tag to VLAN 15 using the rewrite ingress tag push dot1q 15 symmetric command. This pushes a new VLAN tag (15) while maintaining symmetric traffic flow for VLAN translation.This ensures that traffic received on VLAN 10 from R2 is sent across the pseudowire with VLAN 15, satisfying the requirement to rewrite the VLAN for traffic from R2 to R4.
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