Nokia SR Linux EVPN and Data Center Interconnect v1.0
Question 1
Consider the exhibit.
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.
Answer : C
Question 2
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.
Answer : B
Question 3
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.
Answer : B
Question 4
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.
Answer : D
Question 5
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.
Answer : B
Question 6
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.
Answer : B
Question 7
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.
Answer : D
Question 8
Consider the exhibit.
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.
Answer : B
Question 9
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
Answer : D
Question 10
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
Answer : A
Question 11
Consider the exhibit. All three of the leafs have a MP-BGP EVPN session to the route-reflector Spine-1. Leaf-1, Leaf-2 and Leaf-3 have existing instances of an L2 EVPN named MAC VRF-1. Host-1 has just sent its first Ethernet frame into MAC VRF-1 on Leaf-1. Which of the following steps is FALSE?
- A. Leaf-1 populates Host-l’s MAC address learnt on the local interface to its MAC table.
- B. Leaf-1 generates an EVPN route-type 5 update with Host-l’s MAC address and sends it to the route reflector.
- C. The route-reflector forwards the EVPN update to Leaf-2 and Leaf-3.
- D. Leaf-2 and Leaf-3 import the EVPN update based upon the route target.
Answer : B
Question 12
Which of the following statements about a BGP route target is FALSE?
- A. The route-target is a BGP extended community.
- B. It is defined in MP-BGP to allow for overlapping MAC addresses from multiple tenants.
- C. It is advertised with every EVPN route update.
- D. It identifies the EVPN instance in the control plane.
Answer : D
Question 13
When configuring the EVPN MP-BGP route reflector sessions between the leaf and spine routers, which of the following statements is TRUE?
- A. The local-AS number configured within the BGP group will override the AS number configured directly under the BGP protocol.
- B. The cluster-id that uniquely identifies this route reflector session is configured on the route reflector and participating clients.
- C. When redundant route reflectors are deployed, one route reflector will be the primary while the other one will assume a backup role.
- D. Route reflectors can be used instead of a full mesh of eBGP sessions between the leaf and spine routers.
Answer : A
Question 14
Which of the following statements about the configuration of a distributed layer 2 EVPN in a Nokia SR Linux is FALSE?
- A. Each PE participating in the layer 2 EVPN must be configured with the same EVPN instance ID (EVI).
- B. The route distinguisher is auto-generated using the autonomous system number and EVI.
- C. Only one VXLAN-interface can be associated to the layer 2 EVPN.
- D. The route-targets are manually configured when the leaf routers are in different autonomous systems.
Answer : A
Question 15
Which of the following statements about utilizing asymmetric routing in an L3 EVPN network is FALSE?
- A. The ingress PE performs both MAC and IP forwarding.
- B. The egress PE performs MAC forwarding only.
- C. EVPN route-type 5 must be supported by the PEs involved.
- D. Each MAC-VRF used in the L3 EVPN network must exist on each PE.
Answer : C