JN0-351 Übungsfragen: Enterprise Routing and Switching, Specialist (JNCIS-ENT) & JN0-351 Dateien Prüfungsunterlagen

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Juniper JN0-351 Prüfungsplan:

ThemaEinzelheiten
Thema 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.
Thema 2
  • Spanning Tree: Networking professionals explore the principles and advantages of the Spanning Tree Protocol (STP) to ensure loop-free topologies in Layer 2 networks.
Thema 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.
Thema 4
  • High Availability: This topic covers the importance and application of high availability within Junos OS environments. Knowledge in configuring and managing these components is critical for ensuring robust and uninterrupted network operations, aligning with exam expectations.
Thema 5
  • Protocol Independent Routing: An essential domain for understanding routing components outside protocol dependencies, this topic enhances expertise in configuring, monitoring, and troubleshooting critical elements.
Thema 6
  • Layer 2 Security: This topic introduces Layer 2 protection mechanisms and firewall filters to fortify network security. Practical skills in configuring, monitoring, and troubleshooting these features prepare candidates to address exam objectives and real-world challenges effectively.

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JN0-351 Vorbereitung & JN0-351 Prüfung

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Juniper Enterprise Routing and Switching, Specialist (JNCIS-ENT) JN0-351 Prüfungsfragen mit Lösungen (Q87-Q92):

87. Frage
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.)

Antwort: A,C

Begründung:
BGP is a routing protocol that operates between autonomous systems (AS). An AS is a group of routers under a single administrative control. BGP can be classified into two types: internal BGP (IBGP) and external BGP (EBGP). IBGP is the BGP communication between routers within the same AS, while EBGP is the BGP communication between routers in different AS. BGP uses the AS_PATH attribute to record the AS numbers that the route has passed through, and uses it to prevent routing loops and select the best path.
In this scenario, you want to add a second ISP connection and remove the default route to the existing ISP.
This means that you want to have more control over the routing decisions and use BGP to exchange routes with both ISPs. To do this, you need to deploy the BGP protocol in your network and configure both IBGP and EBGP sessions. The correct statements about BGP in this scenario are:
* IBGP peers advertise routes received from EBGP peers to other IBGP peers. This is the default behavior of IBGP, as it allows the routers within the same AS to learn the routes from different EBGP peers and select the best exit point. However, IBGP has a rule that it does not advertise routes received from IBGP peers to other IBGP peers, to avoid creating routing loops. Therefore, option B is correct and option C is incorrect. To overcome this rule, IBGP requires a full mesh topology, where every IBGP router is directly connected to every other IBGP router, or a route reflector or confederation design, where some IBGP routers act as intermediaries to reflect or aggregate the routes to other IBGP routers.
* EBGP peers advertise routes received from IBGP peers to other EBGP peers. This is the default behavior of EBGP, as it allows the routers in different AS to exchange routes and reachability information. However, EBGP has a rule that it does not advertise routes received from EBGP peers to other EBGP peers, to avoid creating routing loops. Therefore, option D is correct and option A is incorrect. To overcome this rule, EBGP uses the AS_PATH attribute to filter out the routes that contain its own AS number, or uses route maps or policies to control the route advertisement. IBGP does not update the next-hop attribute to ensure reachability within an AS, as the next-hop attribute is preserved by IBGP. Instead, IBGP relies on an underlying IGP (Interior Gateway Protocol) to provide reachability to the next-hop.
References: Enterprise Routing and Switching, Specialist (JNCIS-ENT) - Juniper Networks , BGP Fundamentals > BGP Overview | Cisco Press , BGP Essentials: The Protocol - Pluralsight


88. Frage
Which statement is correct regarding Junos OS unicast reverse path forwarding (RPF) checks?

Antwort: A

Begründung:
Unicast Reverse Path Forwarding (RPF) is a security mechanism that verifies whether a received packet's source address is reachable through the interface on which it arrived, based on the routing table. If the check fails, indicating a potentially spoofed source address, the packet can be discarded, helping to prevent IP spoofing-based attacks.


89. Frage
Which statement is correct about IP-IP tunnels?

Antwort: C

Begründung:
"The ENCAPSULATOR does not change the inner IP header, except to decrement the TTL and it remains unchanged during its deliver to the endpoint" - only router that encapsulates the inner packet decrements its TTL - during transit, the inner packet is unchanged.


90. Frage
What is the maximum allowable MTU size for a default GRE tunnel without IPv4 traffic fragmentation?

Antwort: B

Begründung:
Explanation
The maximum allowable MTU size for a default GRE tunnel without IPv4 traffic fragmentation is 1476 bytes1. This is because GRE packets are formed by the addition of the original packets and the required GRE headers1. 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 problems1. The most common IP MTU is 1500-bytes in length (Ethernet)1. 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 use1. 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-Bytes1.


91. Frage
Which two actions are performed by the firewall filter shown in the exhibit? (Choose two.)

Antwort: A,D


92. Frage
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