Free PDF Juniper First-grade JN0-351 - Latest Enterprise Routing and Switching, Specialist (JNCIS-ENT) Exam Camp

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Juniper JN0-351 Exam Syllabus Topics:

Topic	Details
Topic 1	Tunnels: The fundamentals of IP tunneling are emphasized, highlighting their requirements and functionalities. Mastery in configuring, monitoring, and troubleshooting tunnels equips professionals to meet the demands of the JN0-351 exam.
Topic 2	OSPF: The concepts and operational details of OSPF are explored, providing tools for routing efficiency. Configuration and troubleshooting mastery ensure readiness for both the exam and complex enterprise environments.
Topic 3	IS-IS: Aspiring Juniper networking professionals enhance their understanding of IS-IS routing protocols. This topic equips candidates with the knowledge to configure and monitor IS-IS systems, addressing specific exam challenges and practical applications.
Topic 4	Protocol Independent Routing: An essential domain for understanding routing components outside protocol dependencies, this topic enhances expertise in configuring, monitoring, and troubleshooting critical elements.

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Juniper Enterprise Routing and Switching, Specialist (JNCIS-ENT) Sample Questions (Q187-Q192):

NEW QUESTION # 187
Which two statements are correct about Junos OS "screen" options used for security purposes on SRX or EX devices? (Choose two.)

A. Screen options can only be applied to Layer 2 interfaces.
B. Screen options replace the need for firewall filters entirely.
C. Screen options can detect and prevent common Layer 3/4 attacks, such as SYN floods and IP spoofing.
D. Screen options are applied to a zone and inspect traffic entering that zone.

Answer: C,D

Explanation:
Screen options provide protection against common network-layer and transport-layer attacks, such as SYN floods, ICMP floods, and IP address spoofing, by detecting anomalous traffic patterns. Screen options are applied at the zone level and inspect traffic as it enters the associated security zone, complementing but not replacing firewall filters, which provide more granular packet matching and filtering capabilities.

NEW QUESTION # 188
What is the maximum allowable MTU size for a default GRE tunnel without IPv4 traffic fragmentation?

A. 1476 bytes
B. 1496 bytes
C. 1500 bytes
D. 1480 bytes

Answer: A

Explanation:
The maximum allowable MTU size for a default GRE tunnel without IPv4 traffic fragmentation is
1476 bytes. This is because GRE packets are formed by the addition of the original packets and the required GRE headers. These headers are 24-bytes in length and since these headers are added to the original frame, depending on the original size of the packet we may run into IP MTU problems. The most common IP MTU is 1500-bytes in length (Ethernet). When the tunnel is created, it deducts the 24-bytes it needs to encapsulate the passenger protocols and that is the IP MTU it will use. For example, if we are forming a tunnel over FastEthernet (IP MTU 1500) the IOS calculates the IP MTU on the tunnel as: 1500-bytes from Ethernet-24-bytes for the GRE encapsulation = 1476-Bytes.

NEW QUESTION # 189
A number of reports from end users indicate that internal and external communications are intermittent and not reliable. You verified the status of the switch ports and have determined that they are up and operational. You also noticed a very high level of link bandwidth utilization on those same ports. The current topology of the affected environment is shown in the exhibit.

What would be the cause of the reported issues?

A. A lack of a loop-prevention mechanism or protocol.
B. A misconfigured interior gateway protocol (IGP).
C. A lack of port-based ACLs filtering the traffic flows.
D. A malformed route-based ACL improperly filtering traffic flows.

Answer: A

NEW QUESTION # 190
You are an operator for a network running 1S-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. There is a mismatched area ID between the L2 routers.
D. The family iso configuration is missing from the adjacency interface.

Answer: B,D

Explanation:
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 adjacency1.
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 adjacency1.
These explanations are based on the Enterprise Routing and Switching Specialist (JNCIS-ENT) documents and learning resources available at Juniper Networks23.

NEW QUESTION # 191
Which two statements are correct about VRRP? (Choose two.)

A. The VRRP group number must be unique on all participating devices
B. The VRRP group number must match on all participating devices
C. The virtual IP address must match on all participating devices
D. The virtual IP address must be unique on all participating devices

Answer: B,C

Explanation:
The virtual IP address must match on all participating devices - All routers in the same VRRP group must be configured with the same virtual IP address to provide redundancy.
The VRRP group number must match on all participating devices - All routers in the same VRRP group must have the same group number to identify the VRRP group.

NEW QUESTION # 192
......

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