QUESTION: 21

Which statement is correct about IS-IS?

IS-IS uses areas and an autonomous system.
Level 1/2 routers automatically inject a default route to the nearest Level 1 router.
Level 2 routers must share the same area address.
Level 1 routers route traffic between autonomous systems.

Answer(s): A

Explanation:

Level 1/2 routers automatically inject a default route to the nearest Level 1 router. It's the other way around

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QUESTION: 22

The connection between DC1 and DC2 is routed as shown in the exhibit.
In this scenario, which statement is correct?

The border devices must be able to perform Layer 3 routing and provide IRB functionality.
L3VPN must be enabled to advertise reachability.
An IP prefix route provides encoding for intra-subnet forwarding.
Type 2 and Type 5 routes will be exchanged between DC1 and DC2.

Answer(s): A

Explanation:

https://www.juniper.net/documentation/us/en/software/junos/evpn-vxlan/topics/concept/evpn- route-type5-understanding.html

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QUESTION: 23

BGP multipath or multihop are not configured in your network. In this scenario, what is the correct sequence for BGP active route selection?

higher local preference shortest AS path lowest peer address lowest router ID
lower origin code
higher local preference shortest AS path lower origin code lowest router ID
lowest peer address
higher local preference lowest router ID
lowest peer address lower origin code shortest AS path
higher local preference shortest AS path lowest router ID
lowest peer address lower origin code

Answer(s): B

Explanation:

BGP Path Selection process follows this order

1.Weight (Bigger is better)
2. Local preference (Bigger is better)
3. Self originated (Locally injected is better than iBGP/eBGP learned)
4. AS-Path (Smaller is better)
5. Origin
6. MED (Smaller is better)
7. External (Prefer eBGP over iBGP)
8. IGP cost (Smaller is better)
9. EBGP Peering (Older is better)
10. Router- ID
http://www.next-itsolutions.co.uk/wp-content/uploads/2015/09/CCIE-BGP-Best-Path-

Selection1.png https://www.juniper.net/documentation/us/en/software/junos/vpn-l2/bgp/topics/concept/routing- protocols-address-representation.html

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QUESTION: 24

You are troubleshooting an EVPN-VXLAN IP fabric and observe the loop shown in the exhibit.
Which two steps would you take to further troubleshoot this problem? (Choose two.)

Verify that the same ESI is configured on the link from the host and that it matches the source.
Issue the show route table bgp.evpn.0 command on Leaf2 and verify that Type 4 routes are present.
Issue the show route table bgp.evpn.0 command on Leaf2 and verify that Type 3 routes are present.
Verify that the same ESI is configured on the two links from the source.

Answer(s): B,C

Explanation:

Type 2 route, MAC with IP advertisement route--Type 2 routes are per-VLAN routes, so only PEs that are part of a VNI need these routes. EVPN allows an end host's IP and MAC addresses to be advertised within the EVPN Network Layer reachability information (NLRI). This allows for control plane learning of ESI MAC addresses. Because there are many Type 2 routes, a separate route-target auto-derived per VNI helps to confine their propagation. This route type is supported by all EVPN switches and routers. Type 5 route, IP prefix Route--An IP prefix route provides encoding for inter- subnet forwarding. In the control plane, EVPN Type 5 routes are used to advertise IP prefixes for inter-subnet connectivity across data centers. To reach a tenant using connectivity provided by the EVPN Type 5 IP prefix route, data packets are sent as Layer 2 Ethernet frames encapsulated in the VXLAN header over the IP network across the data centers.

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