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Question 1

L3 EVPN

L3 EVPN

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This exam has 40 community-verified practice questions. Create a free account to access all questions, comments, and explanations.

Topics covered:

EVPN on SR LinuxLayer 2 EVPNL3 EVPNL2 and L3 EVPN Multi-homingDCI And 7750 SR interoperability

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Which of the following statements about a L3 EVPN network using symmetric routing is FALSE?

A Each participating PE must support the use of EVPN route-type 5.
B Ingress and egress PEs perform MAC and IP forwarding.
C A routed-VXLAN interface is required on a per IP-VRF basis.
D Each MAC-VRF used in the L3 EVPN network must exist on each PE.

An IRB sub-interface that is being used to interconnect a MAC-VRF to an IP-VRF, is configured with anycast-gw set to true and anycast-gw enabled.
Which of the following statements is FALSE?

A The last octet of the default virtual MAC assigned to the sub-interface is derived from the last octet of the chassis MAC.
B The same IP address used on this sub-interface can be used by other IRB sub-interfaces on remote PEs participating in the IP-VRF.
C The host IP address of the sub-interface appears in the IP-VRF route table along with the prefix for the entire sub-net.
D Two MAC addresses associated to the sub-interface are shown in the forwarding table of the MAC-VRF that contains the IRB sub-interface.

Which of the following is always found in an extended community associated with an EVPN update?

A The route target
B The AFI/SAFI
C The VXLAN network ID
D The EVPN route type

Which EVPN route-type (RT) is used in multi-homing scenarios to support aliasing and fast convergence?

A RT-1 Ethernet Auto-Discovery
B RT-2 MAC/IP Advertisement
C RT-3 Inclusive Multicast Ethernet Tag
D RT-4 Ethernet Segment

Which of the following is NOT part of the description of a BGP route-distinguisher?

A The route-distinguisher is a unique identifier that is configured per PE and per EVI.
B It is included in each EVPN route update advertisement.
C It is used by MP-BGP to allow for overlapping addresses from multiple tenants.
D It identifies the EVPN instance in the control plane.

e-BGP is used as the routing protocol in the data center underlay.
When configuring the EVPN MP-BGP route reflector sessions, which of the following statements is FALSE?

A The cluster-id that uniquely identifies the route reflector is only configured on the route reflector itself.
B The leaf’s underlay autonomous system number is used for the route reflector EVPN peering sessions.
C A second route reflector can be deployed for redundancy purposes.
D If redundant route reflectors are deployed, the client leaf routers will receive duplicated updates.

Consider the exhibit.

Question Image

All three leafs have an EVPN MP-BGP session with the route reflector in Spine-1. Leaf-2 and Leaf-3 have existing instances of an L2 EVPN named MAC VRF-1. Leaf-1 has just enabled a new instance of MAC VRF-1.
Which of the following steps is NOT taken when this new instance is enabled?

A Leaf-1 generates an IMET route.
B Leaf-1 advertises the IMET route in a BGP EVPN update directly to Leaf-2 and Leaf-3.
C Leaf-2 and Leaf-3 auto-discover the new peer based on the route target in the received IMET route.
D Leaf-2 and Leaf-3 add Leaf-1 to their existing flooding list for BUM traffic.

Which of the following statements about utilizing VXLAN for the data plane in the data center is FALSE?

A It allows the creation of a layer 2 overlay network that can span the entire data center.
B VXLAN was developed to support EVPN networks in the data center.
C It may use ECMP to provide efficient utilization of the underlay interfaces within the data center.
D It has the capability to isolate up to 16 million different overlays.

Which of the following GARP functions is FALSE?

A A host sends a GARP to update its own IP/MAC mapping to the other hosts in the subnet.
B All other hosts within the subnet will update their ARP tables.
C The GARP is sent as a broadcast.
D The other hosts in the subnet will acknowledge the receipt with a reply.

Which of the following statements about a distributed layer 2 EVPN is FALSE?

A When a host connected to a layer 2 EVPN responds to an ARP request, it sends an ARP reply to the local leaf.
B The local leaf replicates the ARP reply and sends it to all the leafs in the flooding list for that layer 2 EVPN.
C The local leaf learns the source MAC address from the Ethernet frame and populates it into its MAC forwarding table.
D The local leaf generates an EVPN route type 2 and sends it to all of its configured BGP EVPN neighbors.

Which of the following statements about the Layer 2 EVPN configuration/operation in a Nokia SR Linux is FALSE?

A The layer 2 EVPN is implemented as a MAC-VRF.
B MAC-VRF is configured with a VXLAN-interface towards each remote VTEP.
C Data plane MAC learning takes place on the local interfaces.
D Remote MAC addresses are learned from MP-BGP EVPN updates.

Which of the following statements about MAC mobility is TRUE?

A The original PE advertises the locally learned MAC with the sequence number set to a maximum value.
B A PE advertising a local MAC that was previously learned through EVPN, will decrement the sequence number in its update.
C The originating PE generates a withdraw message after the same locally learned MAC has aged out.
D The originating PE and the destination PE must synchronize their MAC tables.

Consider the exhibit.

Question Image

Which of the following statements is FALSE?

A The remote host’s IP address is 100.0.2.3.
B The MAC address 00:00:00:00:00:01 was learned through the data plane.
C The MAC address associated to the vxlan-interface will not age out.
D The VXLAN network identifier configured for this MAC-VRF is 100.

Consider the exhibit.

Question Image

Which of the following statements about the proxy ARP entry for the neighbor IP 192.168.100.1 is FALSE?

A The state is pending because this MAC address was originally associated with a different IP address.
B The traffic will be forwarded to a blackhole if the state changes to duplicate.
C The MAC address will be changed to 00:00:00:00:DE:AD if the state changes to duplicate.
D All traffic destined to 192.168.100.1 will be discarded for 9 minutes if the state changes to duplicate.

Consider the exhibit.

Question Image

Leaf-1 has received an ARP request from host-1 for host-2. Leaf-1 has added host-1’s MAC address in its MAC table and host-1’s MAC/IP addresses in its proxy-ARP table.
Which of the following steps is FALSE?

A Leaf-1 sends a route-type 2 EVPN update with host-1’s MAC with the IP address set to 0.0.0.0 to the remote peers.
B Leaf-1 sends a route-type 2 EVPN update with host-1’s MAC with the IP address set to 192.168.100.1 to the remote peers.
C The remote peers ignore the EVPN update with the IP address set to 0.0.0.0 and use the update with the IP address set to 192.168.100.1 to populate their MAC forwarding tables.
D The remote peers generate a gratuitous ARP towards their directly connected hosts to announce the learned IP/MAC mapping information.

Which of the following statements about utilizing asymmetric routing in an L3 EVPN network is FALSE?

A If a host interface’s has two IP addresses, it must send out two separate EVPN route-type 2 updates for the MAC-VRF.
B Each PE must have a full ARP table for all of the hosts in the L3 EVPN network.
C All the MAC-VRFs connected to the L3 EVPN network must exist on each PE.
D The ingress and egress PE routers will perform both MAC and IP forwarding.

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