Free JN0-351 Exam Files Verified & Correct Answers Downloaded Instantly [Q51-Q67]

Free JN0-351 Exam Files Verified & Correct Answers Downloaded Instantly

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Juniper JN0-351 Exam Syllabus Topics:

NEW QUESTION # 51
Which statement is correct about IP-IP tunnels?

• A. There are 24 bytes of overhead with IP-IP encapsulation.
• B. IP-IP tunnels only support encapsulating IP traffic.
• C. IP-IP tunnels only support encapsulating non-IP traffic.
• D. The TTL in the inner packet is decremented during transit to the tunnel endpoint.

Answer: B

Explanation:
Explanation
IP-IP tunnels are a type of tunnels that use IP as both the encapsulating and encapsulated protocol. IP-IP tunnels are simple and easy to configure, but they do not provide any security or authentication features. IP-IP tunnels only support encapsulating IP traffic, which means that the payload of the inner packet must be an IP packet. IP-IP tunnels cannot encapsulate non-IP traffic, such as Ethernet frames or MPLS labels1.
Option A is correct, because IP-IP tunnels only support encapsulating IP traffic. Option B is incorrect, because IP-IP tunnels only support encapsulating non-IP traffic. Option C is incorrect, because the TTL in the inner packet is not decremented during transit to the tunnel endpoint. The TTL in the outer packet is decremented by each router along the path, but the TTL in the inner packet is preserved until it reaches the tunnel endpoint2.
Option D is incorrect, because there are 20 bytes of overhead with IP-IP encapsulation. The overhead consists of the header of the outer packet, which has a fixed size of 20 bytes for IPv43.
References:
1: IP-IP Tunneling 2: What is tunneling? | Tunneling in networking 3: IPv4 - Header

NEW QUESTION # 52
You are an operator for a network running IS-IS. Two routers are failing to form an adjacency.
What are two reasons for this problem? (Choose two.)

• A. There are mismatched router IDs on the L2 routers.
• B. There is no configured ISO address on any IS-IS interface.
• C. The family iso configuration is missing from the adjacency interface.
• D. There is a mismatched area ID between the L2 routers.

Answer: B,C

Explanation:
The two reasons for the failure to form an adjacency in a network running IS-IS could be:
B) There is no configured ISO address on any IS-IS interface. IS-IS requires each router interface to have an ISO address configured. Without this address, the routers cannot form an adjacency.
D) The family iso configuration is missing from the adjacency interface. The 'family iso' configuration is essential for IS-IS to function correctly. If this configuration is missing from the adjacency interface, it could prevent the formation of an adjacency.
These explanations are based on the Enterprise Routing and Switching Specialist (JNCIS-ENT) documents and learning resources available at Juniper Networks.

NEW QUESTION # 53
Referring to the exhibit, which router will become the OSPF BDR if all routers are powered on at the same time?

• A. R2
• B. R4
• C. R1
• D. R3

Answer: D

Explanation:
Priority set to 0 will never become DR or BDR so R1 is excluded.
Higher priority is better in OSPF so R2 is lowest than both R3 and R4.
R3 and R4 has the same priority so RID will decide.
R4 has the highest RID so it will become DR and R3 will then become BDR.

NEW QUESTION # 54
Which statement about configuring persistent MAC learning is correct?

• A. Persistent MAC learning requires 802.1X authentication.
• B. Persistent MAC learning cannot be configured on redundant trunk groups.
• C. Persistent MAC learning can be configured on access mode interfaces.
• D. Persistent MAC learning flushes dynamically learned MAC addresses on reboots.

Answer: C

NEW QUESTION # 55
You are receiving multiple BGP routes from an upstream neighbor and only want to advertise a single summarized prefix to your internal OSPF neighbors. This route should only be advertised when you are receiving these BGP routes from this neighbor.
In this scenario, which type of route should you create?

• A. static route using the resolve feature
• B. aggregate route
• C. static route using qualified next hops
• D. generate route

Answer: B

Explanation:
Explanation
In this scenario, you should create an 1. Aggregate routes are used for advertising summarized network prefixes1. They help minimize the number of routing tables in an IP network by consolidating selected multiple routes into a single route advertisement1. This approach is in contrast to non-aggregation routing, in which every routing table contains a unique entry for each route1.
Therefore, option A is correct. Options B, C, and D are not correct because:
Static route using the resolve feature: This type of route uses the resolve feature to install a static route in the routing table only if a specific condition is met1. However, it does not provide the capability to summarize multiple routes into a single prefix.
Generate route: This type of route generates a route that is always present in the routing table and can be used to summarize routes. However, it does not have the capability to only advertise the route when specific BGP routes are being received from a neighbor1.
Static route using qualified next hops: This type of route allows for the specification of multiple next-hop addresses for a static route1. However, it does not provide the capability to summarize multiple routes into a single prefix.

NEW QUESTION # 56
You are configuring an IS-IS IGP network and do not see the IS-IS adjacencies established. In this scenario, what are two reasons for this problem? (Choose two.)

• A. MTU is not at least 1492 bytes.
• B. The Level 2 routers have mismatched areas.
• C. IP subnets are not a /30 address.
• D. The lo0 interface is not included as an IS-IS interface.

Answer: A,D

Explanation:
Option A suggests that the MTU is not at least 1492 bytes. This is correct because IS-IS requires a minimum MTU of 1492 bytes to establish adjacencies. If the MTU is less than this, IS-IS adjacencies will not be established.
Option D suggests that the lo0 interface is not included as an IS-IS interface. This is also correct because the loopback interface (lo0) is typically used as the router ID in IS-IS. If the loopback interface is not included in IS-IS, it could prevent IS-IS adjacencies from being established.

NEW QUESTION # 57
Exhibit

You are troubleshooting an issue where traffic to 192.168.10.0/24 is being sent to R1 instead of your desired path through R2.
Referring to the exhibit, what is the reason for the problem?

• A. R1's route is the best path due to a higher local preference
• B. R1's route is the best path due to the shorter AS path.
• C. R2's route is not the best path due to a lower origin code.
• D. R2's route is not the best path due to loop prevention.

Answer: A

Explanation:
The exhibit shows the output of the command show ip bgp, which displays information about the BGP routes in the routing table1. The output shows two routes for the destination 192.168.10.0/24, one from R1 and one from R2.
The route from R1 has a local preference of 200, while the route from R2 has a local preference of
100. Local preference is a BGP attribute that indicates the degree of preference for a route within an autonomous system (AS)2. A higher local preference means a more preferred route2.
BGP uses a best path selection algorithm to choose the best route for each destination among multiple paths. The algorithm compares different attributes of the routes in a specific order of precedence3. The first attribute that is compared is weight, which is a Cisco-specific attribute that is local to the router3. If the weight is equal or not set, the next attribute that is compared is local preference3.
In this case, both routes have the same weight of 0, which means that they are learned from external BGP (eBGP) peers3. Therefore, the next attribute that is compared is local preference. Since R1's route has a higher local preference than R2's route, it is chosen as the best path and installed in the routing table3. The other attributes, such as origin code and AS path, are not considered in this case.

NEW QUESTION # 58
What are two interarea OSPF LSA types? (Choose two.)

• A. Type 4 ASBR summary LSAs
• B. Type 3 summary LSAs
• C. Type 1 router LSAs
• D. Type 2 network LSAs

Answer: A,B

NEW QUESTION # 59
You are a network operator who wants to add a second ISP connection and remove the default route to the existing ISP You decide to deploy the BGP protocol in the network.
What two statements are correct in this scenario? (Choose two.)

• A. EBGP peers advertise routes received from IBGP peers to other EBGP peers.
• B. IBGP updates the next-hop attribute to ensure reachability within an AS.
• C. IBGP peers advertise routes received from EBGP peers to other IBGP peers.
• D. IBGP peers advertise routes received from IBGP peers to other IBGP peers.

Answer: B,C

Explanation:
A is correct because IBGP updates the next-hop attribute to ensure reachability within an AS. This is because the next-hop attribute is the IP address of the router that advertises the route to a BGP peer. If the next-hop attribute is not changed by IBGP, it would be the IP address of an external router, which may not be reachable by all routers within the AS. Therefore, IBGP updates the next-hop attribute to the IP address of the router that received the route from an EBGP peer1.
B is correct because IBGP peers advertise routes received from EBGP peers to other IBGP peers. This is because BGP follows the rule of advertising only the best route to a destination, and EBGP routes have a higher preference than IBGP routes. Therefore, IBGP peers advertise routes learned from an EBGP peer to all BGP peers, including both EBGP and IBGP peers1.

NEW QUESTION # 60
Which two multicast IP addresses are used for link-state update packets? (Choose two.)

• A. 224.0.0.5
• B. 224.0.0.9
• C. 224.0.0.10
• D. 224.0.0.6

Answer: A,D

NEW QUESTION # 61
Which statement is correct about GRE tunnels?

• A. GRE tunnels only support encapsulating IP traffic.
• B. The time-to-live field in the tunnel payload is decremented during transit.
• C. GRE tunnels only support encapsulating non-IP traffic.
• D. There are 20 bytes of overhead with GRE encapsulation.

Answer: B

NEW QUESTION # 62
Two routers share the same highest priority and start time. In this situation, what is evaluated next when determining the designated router?

• A. The router with the highest MAC address become the DR
• B. The router with the highest router ID becomes the DR
• C. The routers perform another DR election.
• D. The router with the lowest router ID become the DR.

Answer: B

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 # 63
Which command displays the output shown in the exhibit?

• A. show route forwarding-table family ethernet-switching
• B. show ethernet-switching table
• C. show ethernet-switching table extensive
• D. show route forwarding-table

Answer: B

Explanation:
This command shows the Ethernet switching table, which includes information about MAC addresses, their associated VLANs, and the interfaces they are learned on, similar to the output shown in your exhibit.

NEW QUESTION # 64
You have two OSPF routers that will not form an adjacency. You enter the show log trace- ospfcommand.
Referring to the exhibit, which statement is correct?

• A. You are stuck in the ExStart state.
• B. The physical connection has been disconnected.
• C. There is a mismatched subnet.
• D. The wrong OSPF area has been configured.

Answer: D

NEW QUESTION # 65
Which two statements are correct about using firewall filters on EX Series switches? (Choose two.)

• A. You can apply firewall filters to both Layer 2 and Layer 3 traffic on an EX Series switch.
• B. You can only apply firewall filters to Layer 2 traffic on an EX Series switch.
• C. You can deploy both stateless and stateful firewall filters on an EX Series switch.
• D. You can deploy only stateless firewall filters on an EX Series switch.

Answer: A,D

Explanation:
A is correct because you can deploy only stateless firewall filters on an EX Series switch. A stateless firewall filter is a filter that evaluates each packet individually based on the header information, such as source and destination addresses, protocol, and port numbers1. A stateless firewall filter does not keep track of the state or context of a packet flow, such as the sequence number, flags, or sessioninformation1. EX Series switches support only stateless firewall filters, which are also called access control lists (ACLs) or packet filters2.
C is correct because you can apply firewall filters to both Layer 2 and Layer 3 traffic on an EX Series switch. Layer 2 traffic is traffic that is switched within a VLAN or a bridge domain, while Layer 3 traffic is traffic that is routed between VLANs or networks3. EX Series switches support three types of firewall filters: port (Layer 2) firewall filters, VLAN firewall filters, and router (Layer 3) firewall filters4. You can apply these filters to different interfaces and directions to control the traffic entering or exiting the switch.

NEW QUESTION # 66
Which two statements are correct about link aggregation? (Choose two.)

• A. IP traffic is hashed using source and destination MAC addresses.
• B. All RE-generated traffic traverses the lowest member link.
• C. Member links must use the same MTU.
• D. LAGs provide physical layer redundancy.

Answer: C,D

NEW QUESTION # 67
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