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| Section | Objectives |
|---|---|
| Topic 1: Layer 2 Security | - Switch security features
|
| Topic 2: Layer 3 Routing Fundamentals | - Routing protocols
|
| Topic 3: Layer 2 Switching | - Spanning Tree Protocol (STP/RSTP)
|
| Topic 4: High Availability | - Junos HA features
|
| Topic 5: Tunneling Technologies | - IP tunneling
|
Are you planning to appear in the Enterprise Routing and Switching, Specialist (JNCIS-ENT) (JN0-351) certification test and need to know where to get updated practice questions? Then you are at the right place because Enterprise Routing and Switching, Specialist (JNCIS-ENT) (JN0-351) has made the learning material for the applicants to prepare successfully for the certfication exam in a short time.
NEW QUESTION # 81
What are two reasons for creating multiple areas in OSPF? (Choose two.)
Answer: B,C
Explanation:
Option A is correct. Creating multiple areas in OSPF can help to reduce the convergence time .
This is because changes in one area do not affect other areas, so fewer routers need to run the SPF algorithm in response to a change.
Option D is correct. Creating multiple areas in OSPF can help to reduce Link State Advertisement (LSA) flooding across the network. This is because LSAs are not flooded out of their area of origin.
NEW QUESTION # 82
Referring to the exhibit, which two configuration changes must you apply for packets to reach from R1 to R3 using IS-IS? (Choose two.)
Answer: A,D
Explanation:
A) On R1, enable Level 1 on the ge-0/0/1 interface. In IS-IS, both levels (Level 1 and Level 2) are enabled by default when you enable IS-IS on an interface1. Level 1 systems route within an area.
If the destination is outside an area, Level 1 systems route toward a Level 2 system. Therefore, enabling Level 1 on the ge-0/0/1 interface on R1 would allow packets to reach from R1 to R3.
D) On R3 enable Level 1 on the ge-0/0/4 interface Similarly, enabling Level 1 on the ge-0/0/4 interface on R3 would allow packets to reach from R1 to R3. These explanations are based on the IS-IS configuration documents and learning resources available at Juniper Networks1 and Cisco.
NEW QUESTION # 83
What is the management IP address of the device shown in the exhibit?
Answer: D
Explanation:
The management IP address of the device shown in the exhibit is indicated by the interface
"me0." In the provided output, the "me0" interface is listed with the IP address 10.210.20.233.
NEW QUESTION # 84
You are asked to explore adding BGP route reflectors to allow for increased scale in your core network.
Which statement is correct in this scenario?
Answer: A
Explanation:
A route reflector is a BGP router that is allowed to break the iBGP loop avoidance rule and advertise routes received from an iBGP peer to another iBGP peer under specific conditions 1 . A route reflector can have three types of peerings: EBGP neighbor, IBGP client neighbor, and IBGP non-client neighbor 2 . A cluster is a group of route reflectors and their clients that are fully meshed 3 . The cluster ID is a 4-byte value that identifies the route reflector cluster and is carried in the ORIGINATOR_ID attribute of the BGP update message 4 . The cluster ID is used to prevent routing loops among route reflectors and their clients. If a route reflector receives a route with its own cluster ID, it discards the route 5 . Therefore, the cluster ID is required to prevent routing loops when using route reflectors.
References:
1 : What is BGP Route Reflector - Explanation & Discussion (Cisco Example)
2 : BGP Route Reflector - NetworkLessons.com
3 : BGP Route Reflectors (RR) - Cisco Community
4 : Junos OS Routing Protocols Library for Routing Devices
5 : Junos OS Routing Protocols Library for Routing Devices
NEW QUESTION # 85
Two routers share the same highest priority and start time. In this situation, what is evaluated next when determining the designated router?
Answer: C
Explanation:
According to the OSPF protocol, the designated router (DR) is the router that acts as the focal point for exchanging routing information on a multi-access network segment, such as a LAN. The DR election process is based on the following criteria, in order of precedence:
The router with the highest OSPF priority becomes the DR. The default priority is 1, and a priority of 0 means the router will not participate in the election.
If there is a tie in priority, the router with the highest router ID becomes the DR. The router ID is a
32-bit number that uniquely identifies a router in an OSPF domain. It can be manually configured or automatically derived from the highest IP address of a loopback interface or a physical interface. If there is a tie in router ID, the router that was first to become an OSPF neighbor becomes the DR. In your scenario, two routers share the same highest priority and start time.
This means that they have equal chances of becoming the DR based on the first and third criteria. Therefore, the second criterion will be used to break the tie, which is the router ID. The router with the highest router ID will become the DR, and the other router will become the backup designated router (BDR), which is ready to take over the role of DR if it fails.
NEW QUESTION # 86
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