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최신 JNCIS-SP JN0-364 무료샘플문제 (Q62-Q67):

질문 # 62
You are designing a high availability solution for a Juniper router with dual Routing Engines (RE). You want to ensure that the routing protocol state is preserved during an RE switchover. You have already enabled graceful Routing Engine switchover (GRES) and you want to avoid relying on helper routers to maintain the routing protocol state. In this scenario, which feature would accomplish this behavior?

A. graceful restart
B. bidirectional forwarding detection
C. non-stop active bridging
D. non-stop active routing

정답：D

설명：
When designing High Availability (HA) for Juniper Service Provider routers, understanding the interaction between the control plane and data plane is vital. The user has already enabledGraceful Routing Engine Switchover (GRES), which synchronizes the interface and kernel state between the primary and backup Routing Engines (REs). However, GRES by itself does not preserve the routing protocol state (like OSPF adjacencies or BGP sessions).
To achieve the preservation of the routing protocol state without relying on external "helper" routers, you must implementNon-Stop Active Routing (NSR). According to Juniper Networks documentation, NSR uses the infrastructure provided by GRES to also synchronize the routing protocol process (rpd) information.
Under NSR, the backup RE maintains a "hot" standby state of all routing protocols. If the primary RE fails, the backup RE takes over immediately. Because it already possesses the full routing table and peer session states, the peering neighbors are unaware that a switchover occurred. No protocol adjacency resets occur, and traffic continues to flow uninterrupted.
It is crucial to differentiate NSR fromGraceful Restart (Option C). While Graceful Restart also aims to maintain traffic flow during a switchover, itdoesrequire help from neighboring routers (known as "helper mode"). If the neighbors do not support or are not configured for Graceful Restart, the sessions will drop.
Since the user explicitly stated they want to "avoid relying on helper routers," Graceful Restart is not the correct solution.
Non-stop Active Bridging (Option A)provides a similar "hitless" failover but specifically for Layer 2 environments (STP/VLANs) rather than Layer 3 routing protocols.BFD (Option B)is a failure detection protocol used to speed up convergence but does not preserve state during an RE failover; in fact, without NSR, BFD would likely trigger a faster teardown of the session during a switchover. Therefore,NSRis the only feature that meets the requirement for independent control-plane preservation.

질문 # 63
You are asked to configure interfaces on Juniper devices to support dual VLAN tags. In this scenario, which two interface statements would accomplish this task? (Choose two.)

A. flexible-vlan-tagging
B. vlan-tagging
C. stacked-vlan-tagging
D. gigether-options

정답：A,C

설명：
To supportdual VLAN tagging(often referred to as Q-in-Q or 802.1ad), a Juniper interface must be configured to process more than one 802.1Q header. In Junos OS, this is handled at the physical interface level ([edit interfaces <interface-name>]).
According to Juniper Service Provider documents, two primary configuration statements enable this capability:
* stacked-vlan-tagging (Option D):This is the traditional command used to enable an interface to accept frames with two VLAN tags. When this is enabled, the router expects an outer "service" tag and an inner "customer" tag. This is specifically used in provider edge scenarios where a service provider is tunneling multiple customer VLANs.
* flexible-vlan-tagging (Option A):This is a more modern and versatile command. It allows the interface to support a mix of different encapsulation types across different logical units. For example, with flexible-vlan-tagging, you can have one logical unit (unit 10) doing standard single-tagging and another logical unit (unit 20) doing dual-tagging (vlan-tags outer X inner Y). This is the preferred method on newer hardware (like the MX Series) because it provides the highest level of configuration flexibility.
Vlan-tagging (Option C)only enables the interface to support a single 802.1Q tag, andgigether-options (Option B)contains physical-layer settings like auto-negotiation or flow control, which do not influence VLAN encapsulation. Therefore, A and D are the correct mechanisms for enabling dual-tag support.

질문 # 64
Exhibit:

You have configured an MPLS LSP to 192.168.100.3. However, the LSP is in the down state. Referring to the exhibit, which two actions would solve this problem? (Choose two.)

A. Issue the set interfaces lo0 family mpls command on router R1 and commit.
B. Issue the set protocols ospf traffic-engineering command and commit.
C. Issue the set routing-options rib inet.3 static route 192.168.100.1 command and commit.
D. Issue the set protocols mpls label-switched-path to-r3 no-cspf command and commit.

정답：B,D

설명：
In a Juniper Networks environment, establishing a functionalMultiprotocol Label Switching (MPLS)Label- Switched Path (LSP) requires synchronized control plane operations. According to Juniper technical documentation, the most common reason for an LSP to remain in the "Down" state at the ingress router is a failure of theConstrained Shortest Path First (CSPF)algorithm during the path computation phase.
The provided exhibit for routerR1reveals a critical error in the show mpls lsp detail output: "CSPF: could not determine self". This specific error indicates that the CSPF process is unable to find its own local router ID within theTraffic Engineering Database (TED). For CSPF to build a valid TED, the underlying Interior Gateway Protocol (IGP), such as OSPF, must be configured to flood opaque link-state advertisements (Type
10 LSAs) that carry traffic engineering attributes. As seen in the OSPF configuration, traffic engineering is not enabled. Therefore, issuing theset protocols ospf traffic-engineeringcommand (Option D) will allow R1 to populate the TED with its own local information and that of its neighbors, enabling CSPF to calculate a valid path.
Alternatively, an administrator can choose to bypass the requirement for a TED entirely by disabling CSPF on the specific LSP. By issuing theset protocols mpls label-switched-path to-r3 no-cspfcommand (Option B), the router will stop attempting to perform a constrained path calculation. Instead, the signaling protocol (RSVP) will rely on the standardinet.0routing table to determine the hop-by-hop path to the egress destination (192.168.100.3), allowing the LSP to establish without traffic engineering constraints.
Regarding the other options, whilefamily mplsis required on all transit interfaces, the ingress loopback interface (lo0) generally does not require it for standard LSP signaling unless it's used as a transit hop.
Furthermore, adding a static route toinet.3(Option A) is used for next-hop resolution of BGP routes over LSPs but does not assist in the signaling or establishment of the LSP itself.

질문 # 65
In an OSPF network, what is a purpose of a designated router?

A. to forward traffic within the configured subnet
B. to reduce OSPF traffic on the OSPF segment
C. to assign an OSPF router ID to all routers in the OSPF segment
D. to flood routes to all other OSPF devices in the entire domain

정답：B

설명：
On multi-access network segments, such asEthernet, OSPF could potentially face a scalability issue. If every router on a segment formed a full adjacency with every other router, the number of adjacencies would follow the formula $n(n-1)/2$. In a segment with 10 routers, this would result in 45 adjacencies, each generating redundant flooding of Link-State Advertisements (LSAs) and excessive Hello traffic.
To solve this, OSPF elects aDesignated Router (DR)and aBackup Designated Router (BDR). According to Juniper Networks documentation, the primary purpose of the DR is to act as a central point of contact for the segment, therebyreducing OSPF traffic (Option C).
Instead of every router syncing with every other router, they all form aFull adjacencyonly with the DR and BDR. When a router (a DR-Other) has an update, it sends it to the multicast address224.0.0.6(All DR Routers). The DR then acknowledges the update and floods it to all other routers on the segment using the multicast address224.0.0.5(All OSPF Routers). This "hub-and-spoke" signaling model within the local segment significantly minimizes the bandwidth consumed by protocol overhead and reduces the CPU load on the participating routers.
It is important to note that the DR's scope is limited to the local segment; it does not "assign IDs" (Option A) nor does it flood routes to the "entire domain" (Option D), as that is the responsibility of individual routers within their respective areas.

질문 # 66
How are routing loops prevented in internal BGP networks?

A. External BGP routes are never readvertised to other external BGP neighbors.
B. External BGP routes are never readvertised to other internal BGP neighbors.
C. Internal BGP routes are never readvertised to other internal BGP neighbors.
D. Internal BGP routes are never readvertised to other external BGP neighbors.

정답：C

설명：
The prevention of routing loops within an Autonomous System (AS) is handled differently than loop prevention between ASes. While External BGP (EBGP) uses the AS_PATH attribute to detect loops,Internal BGP (IBGP)does not modify the AS_PATH. Therefore, a different mechanism is required to ensure that a route does not circulate infinitely inside the network.
This mechanism is known as theIBGP Split Horizon rule. According to Juniper Networks documentation and the BGP standard (RFC 4271), a BGP speakermust not advertise a route learned via an IBGP peer to any other IBGP peer. In simpler terms, "what is learned internally, stays local." This rule ensures that a route only travels one "hop" inside the AS-from the router that learned it from an external source to all other internal routers.
Because of this rule, IBGP routers do not naturally propagate routes through each other. This creates a requirement for afull meshof IBGP sessions, where every BGP-speaking router in the AS must have a direct peering session with every other BGP-speaking router. To mitigate the scaling issues of a full mesh in large service provider networks, architects useRoute ReflectorsorConfederations, which are authorized exceptions to the Split Horizon rule.
Option B is incorrect because EBGP peersdoadvertise EBGP routes to other EBGP peers (this is how the internet works). Option C is incorrect because EBGP-learned routesmustbe sent to IBGP peers so the internal network knows how to reach the outside world. Option D is incorrect because internal routesmustbe sent to external peers to advertise your network to the internet.

질문 # 67
......

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