JN0-364「Service Provider Routing and Switching, Specialist (JNCIS-SP)」はJuniperの一つ認証試験として、もしJuniper認証試験に合格してIT業界にとても人気があってので、ますます多くの人がJN0-364試験に申し込んで、JN0-364試験は簡単ではなくて、時間とエネルギーがかかって用意しなければなりません。
| Section | Objectives |
|---|---|
| Topic 1: Troubleshooting and Operations | - Performance and monitoring
|
| Topic 2: BGP and Routing Policy | - BGP fundamentals
|
| Topic 3: MPLS and Service Provider Technologies | - VPN services
|
| Topic 4: Service Provider Architecture & Junos Fundamentals | - Service provider network design basics
|
| Topic 5: OSPF and IS-IS Routing Protocols | - IS-IS operation in service provider networks
|
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質問 # 52
Which statement describes integrated routing and bridging (IRB) interfaces?
正解：A
解説：
An Integrated Routing and Bridging (IRB) interface is used to provide Layer 3 routing services to hosts within a bridge domain. The IRB acts as a default gateway for hosts in that domain, enabling communication with other networks.
質問 # 53
Exhibit:
Referring to the exhibit, you have configured R1, R2, R3, and R4 to be a part of OSPF area 0 and you have connected them to a broadcast segment. Assuming all four routers come online within one minute of each other, which router becomes the DR and which router becomes the BDR?
正解：D
解説：
In OSPF networks, when multiple routers are connected to a shared multi-access broadcast segment (like an Ethernet switch), they undergo an election process to select aDesignated Router (DR)and aBackup Designated Router (BDR). This mechanism is essential for reducing the number of adjacencies and limiting the volume of Link State Advertisement (LSA) flooding on the segment.
The OSPF election process follows a strict hierarchy based on the following criteria:
* Interface Priority:The router with the highest OSPF interface priority is elected as the DR. The router with the second-highest priority becomes the BDR. In Junos, the default priority is 128, but it can be manually configured between 0 and 255.
* Router ID:If there is a tie in priority, the router with the numerically highest Router ID (RID) wins the election.
Analyzing the configuration provided in the exhibit:
* R1:Priority 200, Router-ID 192.168.1.1
* R2:Priority 100, Router-ID 192.168.1.2
* R3:Priority 50, Router-ID 192.168.1.3
* R4:Priority 90, Router-ID 192.168.1.4
Comparing the priority values,R1 has the highest priority (200)and therefore becomes theDR. The next highest priority value among the remaining routers is100, which belongs to R2, making it theBDR. Although R4 has a higher Router ID than R2, the priority value is evaluated first and takes precedence.
Since all routers came online within a short window (one minute), they participate in the same election cycle, ensuring the configured priorities dictate the outcome rather than "first-come, first-served" preemption behavior common in OSPF once a DR is already established.
質問 # 54
Which two statements about graceful restart are correct? (Choose two.)
正解：A、C
解説：
Graceful Restart (GR)is a high-availability mechanism designed to minimize the impact of a routing protocol process (rpd) restart or a Routing Engine (RE) switchover. It allows a router to continue forwarding traffic while the control plane is recovering, provided that the data plane (Packet Forwarding Engine) remains intact.
According to Juniper Networks documentation, Graceful Restart operates in two distinct roles:
* Restarting Mode:This is the role of the router that is actually undergoing the restart. In Junos OS, this mode isnot enabled by default (Option A). An administrator must explicitly configure graceful-restart under the [edit routing-options] hierarchy to allow the router to signal its neighbors that it is attempting a graceful recovery.
* Helper Mode:This is the role of the neighboring routers. When a neighbor sees a router restart, if it is in "helper mode," it will continue to forward traffic toward the restarting router and will not flush the associated routes from its forwarding table for a specified period. In Junos,helper mode is enabled by default (Option B)for most protocols (OSPF, BGP, IS-IS). This means that even if you haven't configured GR on your own router, it will automatically assist its neighbors if they perform a graceful restart.
Why other options are incorrect:
* Option C:WhileGRES (Graceful Routing Engine Switchover)is often usedwithGraceful Restart to handle hardware-level RE failures, they are independent features. GR can function during a simple software process restart without dual REs or GRES.
* Option D:Nonstop Bridging (NSB)is a separate high-availability feature for Layer 2 protocols (like STP). While it shares a similar goal, Graceful Restart is specifically a Layer 3 protocol mechanism (Layer 2 does not use "helper" routers in the same way).
質問 # 55
Which two statements about the BGP path selection process are correct? (Choose two.)
正解：B、C
質問 # 56
You are configuring BGP on a Juniper router to peer with an external provider. After committing the configuration, the BGP session remains in the Idle state. Which configuration issue would prevent the BGP session from progressing beyond the Idle state?
正解：C
解説：
In the BGP finite state machine, theIdlestate is the "stop" or "start" point of the protocol. When a session is stuck in Idle, it means the BGP process is either administratively disabled or, more commonly, is unable to initiate the underlying TCP connection required for BGP.
According to Juniper Networks Service Provider documentation, the most common reason for a BGP session to remain in Idle is a lack ofrouting reachability. For BGP to move to theConnectstate, the Junos kernel must have a route to the IP address specified in the neighbor statement. If thepeer IP address is unreachable (Option A)-meaning there is no route in inet.0 (via OSPF, IS-IS, or static)-the router cannot initiate the TCP three-way handshake on port 179. Consequently, the state machine will never progress.
Analysis of incorrect options:
* Option B:BGP does not care if the local AS is higher or lower than the peer's; it only cares if they match the configuration. AS numbers are identifiers, not priorities.
* Option C:A mismatchedRouter IDdoes not prevent a session from leaving the Idle state. It would typically cause the session to reach theOpenConfirmstate, and then fail with a "Notification" message due to a collision or identification error.
* Option D:While a mismatchedgroup type(internal vs. external) will cause the session to fail, it usually fails during theOpenmessage exchange (OpenSent state) because the AS numbers provided will not match the expected peer type (IBGP vs. EBGP).
Only the lack of a path to the neighbor (reachability) keeps the session at the very beginning of the process:
theIdlestate.
質問 # 57
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