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Free PDF Juniper - JN0-364 - Trustable Service Provider Routing and Switching, Specialist (JNCIS-SP) Exam Topics Pdf

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Juniper Service Provider Routing and Switching, Specialist (JNCIS-SP) Sample Questions (Q57-Q62):

NEW QUESTION # 57
What are three extension headers supported by IPv6? (Choose three.)

A. header checksum
B. destination options
C. fragment
D. hop-by-hop options
E. protocol

Answer: B,C,D

Explanation:
One of the most significant architectural improvements in IPv6 is the move from a complex, variable-length header (as seen in IPv4) to a streamlined, fixed-length base header of 40 bytes. Additional functionality that was previously handled by "Options" in IPv4 is now moved toExtension Headers, which are inserted between the IPv6 base header and the upper-layer protocol (TCP/UDP).
According to Juniper Networks technical documentation and RFC 8200, the following are valid IPv6 Extension Headers:
* Hop-by-Hop Options (Option B):This header carries optional information that must be examined by every node along the delivery path. It is used for features like the Router Alert and Jumbo Payload options.
* Fragment (Option E):Unlike IPv4, where any router can fragment a packet, in IPv6, fragmentation is performed only by the source node. The Fragment header contains the information necessary for the destination to reassemble the packet (Offset, Identification, and More Fragments flag).
* Destination Options (Option A):This header carries information intended only for the destination node. It can appear twice: once before a routing header and once after.
Why other options are incorrect:
* Protocol (Option C):In IPv4, this was a field in the header. In IPv6, this is replaced by theNext Header field, which identifies the type of the following header (whether it's an extension header or the upper- layer protocol).
* Header Checksum (Option D):This field was entirely removed in IPv6. IPv6 relies on the data link layer (Ethernet) and the transport layer (TCP/UDP) to perform error detection, significantly reducing the processing overhead for routers in the core of a service provider network.

NEW QUESTION # 58
Which BGP attribute is optional, transitive, and is passed unchanged to other BGP peers if not recognized?

A. MED
B. AS Path
C. Origin
D. Community

Answer: D

Explanation:
BGP attributes are categorized into four distinct types based on how they are handled by a BGP speaker:Well- known mandatory,Well-known discretionary,Optional transitive, andOptional non-transitive.
Understanding these categories is essential for traffic engineering and ensuring consistent policy across an Autonomous System.
According to Juniper Networks technical documentation, theCommunityattribute is classified as anoptional transitiveattribute. The term "optional" implies that a BGP implementation is not required to support or recognize the attribute. However, because it is "transitive," if a Juniper router receives an update containing a community tag that it does not recognize or has no specific policy for, it must accept the attribute and pass it along to other BGP peers unchanged. This ensures that community-based policies can be signaled across intermediate ASes that may not be configured to act upon those specific tags.
In contrast:
* Origin (Option A)andAS Path (Option B)arewell-known mandatoryattributes. Every BGP update must include these, and every BGP-compliant router must recognize them.
* MED (Option D)(Multi-Exit Discriminator) is anoptional non-transitiveattribute. If a router receives a MED and advertises that route to an EBGP peer, the MED is typically stripped away (unless specific configurations like path-selection cisco-non-deterministic are used), as it is intended only to influence the immediate neighboring AS.
The Community attribute (defined in RFC 1997) is a powerful tool in Junos OS, often used for tagging routes to trigger specific routing policies, such as setting local preference or identifying the geographic origin of a prefix. By being transitive, it allows for sophisticated administrative control across complex multi-provider environments.

NEW QUESTION # 59

In the exhibit, Site A is sending traffic to Site B. R1 adds MPLS label 7166 to direct the traffic to R5. Which two criteria did R1 use to determine which label number to add to the traffic? (Choose two.)

A. a label number received from R5
B. a label number advertisement received from R2
C. the source address of the traffic
D. the destination address of the traffic

Answer: B,D

Explanation:
In a Juniper Networks MPLS environment, the process by which a router determines how to forward traffic involves both the control plane and the data plane. When R1 (acting as an Ingress Label Edge Router, or LER) receives an IP packet from Site A destined for Site B, it must perform a lookup to decide whether to forward the packet via standard IP routing or via an MPLS Label Switched Path (LSP).
The first criterion R1 uses is thedestination address of the traffic(Option C). Upon receiving the native IP packet, R1 looks up the destination IP in its routing table (typically inet.0). If the destination matches a prefix that is associated with an LSP-such as the loopback address of R5 or a prefix reachable via R5-the router identifies the appropriate Forwarding Equivalence Class (FEC). The FEC essentially groups packets that should be forwarded in the same manner over the same path. Without identifying the destination, the router cannot map the traffic to the correct MPLS tunnel.
The second criterion is thelabel number advertisement received from R2(Option D). MPLS relies on downstream label allocation. In this topology, R2 is the immediate downstream "next hop" for R1 on the path to Site B. For the LSP to be established, R2 must signal a label to R1 using a protocol like LDP (Label Distribution Protocol) or RSVP (Resource Reservation Protocol). This label (in this case, 7166) tells R1: "If you want to send traffic to the destination associated with this LSP, wrap it in this specific label so I know how to process it." R1 does not use the source address (Option A) for standard label mapping, nor does it receive the label directly from R5 (Option B) in a hop-by-hop signaling model; it must use the label provided by its direct neighbor, R2. Therefore, by combining the destination IP (to find the path) and the label provided by the next hop (to encapsulate the packet), R1 successfully directs the traffic through the MPLS core.

NEW QUESTION # 60
What prevents routing loops in a single-area OSPF network?

A. Forwarding policies
B. The Dijkstra algorithm
C. Routing policies
D. The Bellman-Ford algorithm

Answer: B

Explanation:
In OSPF, loop prevention within a single area is achieved through the fundamental nature of its link-state architecture. Unlike distance-vector protocols that rely on "routing by rumor," OSPF ensures that every router within an area maintains an identicalLink-State Database (LSDB). This database acts as a complete map of the network topology.
Once the LSDB is synchronized, each router independently executes theShortest Path First (SPF) algorithm
, which is formally known as theDijkstra algorithm. This mathematical process treats the local router as the
"root" of a tree and calculates the shortest path to every other node (router) and prefix in the area based on the cumulative interface costs. Because every router uses the same synchronized map (the LSDB) and the same deterministic algorithm, they all arrive at a consistent, loop-free view of the best paths.
According to Juniper Networks technical documentation, the Dijkstra algorithm is superior to theBellman- Ford algorithm(used by distance-vector protocols like RIP) in this regard. Bellman-Ford is susceptible to
"count-to-infinity" problems and loops because routers only know the distance and direction to a destination provided by their neighbors, rather than the full topology. In OSPF, even if a link fails, the updated Link-State Advertisement (LSA) is flooded rapidly, and the Dijkstra algorithm is re-run to find a new loop-free path.
Routing policies(Option B) are used to manipulate path selection or filter routes but are not the primary mechanism for fundamental loop prevention in OSPF. Similarly,forwarding policies(Option D) govern how traffic is handled at the data plane level rather than determining the control plane's loop-free topology.

NEW QUESTION # 61
Exhibit:
user@R2> show route 198.51.100.1
inet.0: 19 destinations, 19 routes (19 active, 0 holddown, 0 hidden)
Restart Complete
+ = Active Route, - = Last Active, * = Both
198.51.100.1/32 *[Static/5] 5d 21:02:26
> to 203.0.113.65 via ge-0/0/3.0
user@R2> show route 172.20.110.0/24
inet.0: 19 destinations, 19 routes (19 active, 0 holddown, 0 hidden)
Restart Complete
+ = Active Route, - = Last Active,
* = Both
172.20.110.0/24 *[Static/5] 10:43:01
> via gr-0/0/0.0
Referring to the exhibit, traffic destined to which network will be sent through the tunnel?

A. 172.20.110.0/24
B. 198.51.100.1/32
C. 203.0.113.65
D. 0.0.0.0/0

Answer: A

Explanation:
To determine which traffic is being sent through a tunnel in a Junos OS environment, an administrator must analyze the routing table output for the exit interface associated with each destination prefix. The provided exhibit shows the results of the show route command on routerR2for two specific destination networks.
In the first output, the destination198.51.100.1/32is an active static route. The next-hop information specifies that traffic for this address is sent to the gateway 203.0.113.65 via the interfacege-0/0/3.0. According to Juniper Networks interface naming conventions, the prefixge-denotes aGigabit Ethernetinterface, which represents a standard physical connection. Therefore, this traffic does not traverse a tunnel.
In the second output, the destination172.20.110.0/24is also an active static route. However, the next-hop for this network is listed asvia gr-0/0/0.0. In the Junos operating system, thegr-prefix explicitly identifies a Generic Routing Encapsulation (GRE) tunnel interface. GRE is a widely used protocol in service provider networks to encapsulate various network layer protocols over an IP backbone, effectively creating a virtual point-to-point link. Because the routing table has installed the route for 172.20.110.0/24 specifically via the gr- interface, all traffic destined for this network will be encapsulated and sent through the tunnel.
The other choices are incorrect for the following reasons:
* 203.0.113.65 (Option B):This is the next-hop IP address for the physical Gigabit Ethernet path; it is not a destination network directed to a tunnel.
* 0.0.0.0/0 (Option C):There is no information in the exhibit regarding a default route.
* 198.51.100.1/32 (Option D):As identified by thege-interface prefix in the exhibit, traffic for this destination is sent via a physical Ethernet link.

NEW QUESTION # 62
......

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