View Full Juniper JN0-364  Exam Dumps and Practice Test Dumps

 

Question: 281. Which Junos command displays detailed information about all interfaces, including statistics and operational details?

1. show interfaces
   2. show interfaces terse
   3. show route
   4. show system alarms

Correct Answer: 1. show interfaces

Explanation:

The show interfaces command provides detailed operational information about interfaces, including their administrative and operational status, physical properties, traffic statistics, errors, and other interface-specific information. The show interfaces terse command provides a much more compact summary and is useful for quickly checking interface status. show route displays routing information, while show system alarms displays active system alarms. When investigating interface errors, packet counters, physical problems, or detailed operational behavior, the full show interfaces command is generally more appropriate.

Question: 282. Which BGP attribute is used to influence outbound traffic selection within an autonomous system?

1. MED
   2. Local Preference
   3. AS_PATH
   4. NEXT_HOP

Correct Answer: 2. Local Preference

Explanation:

BGP Local Preference is commonly used within an autonomous system to influence which exit point should be preferred for outbound traffic. A higher Local Preference is generally preferred. Because Local Preference is propagated through iBGP, administrators can use it to influence route selection across multiple routers in the same AS. MED is commonly used to influence how a neighboring AS selects an entry point, while AS_PATH records autonomous systems traversed and NEXT_HOP identifies the next-hop address. Local Preference is therefore a major tool for controlling outbound traffic paths.

Question: 283. Which OSPF packet is used to discover and maintain neighboring routers?

1. Link-State Update
   2. Database Description
   3. Hello
   4. Link-State Acknowledgment

Correct Answer: 3. Hello

Explanation:

OSPF Hello packets are used to discover neighboring routers and maintain existing neighbor relationships. They carry information such as router identity, area information, timers, and other parameters needed to determine whether neighboring routers are compatible. Once neighbors establish communication, additional OSPF packet types are used for database synchronization and LSA exchange. Database Description packets summarize link-state information, Link-State Requests ask for specific LSAs, and Link-State Acknowledgments confirm receipt of LSAs. Hello packets therefore form the foundation of OSPF neighbor discovery and maintenance.

Question: 284. Which address represents the IPv4 default route?

1. 127.0.0.0/8
   2. 255.255.255.255/32
   3. 0.0.0.0/0
   4. 224.0.0.0/4

Correct Answer: 3. 0.0.0.0/0

Explanation:

The IPv4 default route is represented by 0.0.0.0/0. Because the prefix contains zero network-specific bits, it can match any IPv4 destination for which a more specific route is not available. Routers commonly use a default route to forward traffic toward an upstream router or Internet gateway when no specific destination route exists. The 127.0.0.0/8 range is reserved for loopback addresses, 224.0.0.0/4 is used for multicast, and 255.255.255.255/32 is the limited broadcast address.

Question: 285. Which Junos feature allows a backup Routing Engine to take over control-plane responsibilities during a failure?

1. GRES
   2. LACP
   3. VRRP
   4. BFD

Correct Answer: 1. GRES

Explanation:

Graceful Routing Engine Switchover (GRES) supports high availability by allowing a backup Routing Engine to assume control-plane responsibilities when the primary Routing Engine becomes unavailable. The forwarding plane can continue forwarding traffic during the switchover, helping reduce service disruption. LACP provides link aggregation, VRRP provides first-hop gateway redundancy, and BFD provides rapid failure detection. GRES is therefore specifically associated with redundancy between Routing Engines on supported Junos platforms.

Question: 286. Which OSPF LSA describes the links and state information of an individual router within an area?

1. Type 1 Router LSA
   2. Type 3 Summary LSA
   3. Type 5 AS External LSA
   4. Type 2 Network LSA

Correct Answer: 1. Type 1 Router LSA

Explanation:

A Type 1 Router LSA is originated by an OSPF router to describe its links, interfaces, and associated link states within an area. OSPF routers use this information to build the link-state database and calculate shortest paths. Type 2 Network LSAs describe multiaccess networks represented by a DR, Type 3 Summary LSAs are generated by ABRs to advertise inter-area networks, and Type 5 AS External LSAs describe external routes. Router LSAs are therefore fundamental to the topology information used by OSPF’s SPF calculation.

Question: 287. Which BGP attribute can be used to influence the preferred entry point into an autonomous system?

1. NEXT_HOP
   2. Local Preference
   3. MED
   4. Origin

Correct Answer: 3. MED

Explanation:

The Multi-Exit Discriminator (MED) can provide a neighboring autonomous system with information about which entry point should be preferred when multiple connections exist between autonomous systems. Lower MED values are generally preferred when the attribute is compared. Local Preference is normally used internally to influence outbound traffic, while NEXT_HOP identifies the next-hop address and Origin describes how the route entered BGP. MED therefore provides a mechanism for influencing the neighboring AS’s selection of an inbound path.

Question: 288. Which Junos command can display a specific route and its detailed next-hop information?

1. show route <prefix> detail
   2. show interfaces terse
   3. show chassis hardware
   4. show system uptime

Correct Answer: 1. show route <prefix> detail

Explanation:

The show route <prefix> detail command provides detailed information about a selected route in the Junos routing table. The output can include the route’s protocol source, preference, next hop, interface, and other attributes depending on the route type. This makes the command useful when investigating why a particular path was selected or determining how traffic toward a specific destination will be forwarded. The other commands provide interface summaries, hardware inventory, or system uptime rather than detailed information about an individual route.

Question: 289. Which protocol is a link-state interior gateway protocol that uses a shortest-path calculation?

1. RIP
   2. BGP
   3. OSPF
   4. VRRP

Correct Answer: 3. OSPF

Explanation:

OSPF is a link-state interior gateway protocol that builds a link-state database representing the network topology and uses the Shortest Path First algorithm to calculate routes. Routers exchange LSAs so that each router can maintain an appropriate view of the topology within its area. RIP is a distance-vector protocol, BGP is primarily an exterior gateway protocol, and VRRP provides gateway redundancy rather than dynamic route calculation. OSPF’s link-state design allows it to converge efficiently and support hierarchical network structures through its area architecture.

Question: 290. Which Junos command displays the system’s current active configuration?

1. show route
   2. show configuration
   3. show bgp summary
   4. show interfaces terse

Correct Answer: 2. show configuration

Explanation:

The show configuration command displays the Junos configuration hierarchy, allowing administrators to review configured interfaces, routing protocols, policies, system services, and other settings. It is an operational-mode command commonly used to inspect the active configuration. show route displays routing information, show bgp summary provides BGP session information, and show interfaces terse summarizes interface status. Reviewing the configuration is an important step when verifying whether a routing or interface behavior is supported by the device’s configured settings.

Question: 291. Which BGP community prevents a route from being advertised to any BGP peer?

1. internet
   2. no-export
   3. no-advertise
   4. local-AS

Correct Answer: 3. no-advertise

Explanation:

The BGP no-advertise community prevents a route from being advertised to any BGP peer. It is therefore more restrictive than the no-export community, which generally prevents advertisement outside the local autonomous system but allows appropriate internal propagation. The internet community permits normal advertisement behavior, subject to configured routing policies. Communities such as these allow network administrators to control route propagation without having to manipulate every individual route independently.

Question: 292. Which IPv6 prefix is reserved for link-local addresses?

1. 2000::/3
   2. FF00::/8
   3. FE80::/10
   4. FC00::/7

Correct Answer: 3. FE80::/10

Explanation:

The FE80::/10 prefix is reserved for IPv6 link-local unicast addresses. Link-local addresses are used for communication on the local network segment and are not normally routed across IPv6 routers. They are important for Neighbor Discovery and are commonly used by IPv6 routing protocols for communication with directly connected neighbors. FC00::/7 is used for unique local addresses, FF00::/8 is the multicast range, and 2000::/3 is associated with globally routable unicast addresses. Recognizing these prefixes is essential when troubleshooting IPv6 addressing.

Question: 293. Which Junos command displays OSPF neighbor relationships?

1. show ospf neighbor
   2. show route protocol ospf
   3. show bgp summary
   4. show route forwarding-table

Correct Answer: 1. show ospf neighbor

Explanation:

The show ospf neighbor command displays OSPF neighbor relationships and their current states. It can show information such as neighbor router IDs, interface associations, adjacency states, and related operational details. This command is particularly useful when troubleshooting OSPF adjacency formation. show route protocol ospf instead displays OSPF-learned routes, while show bgp summary focuses on BGP sessions and show route forwarding-table displays forwarding information. Verifying the neighbor state is often a useful first step when expected OSPF routes are missing.

Question: 294. Which BGP attribute identifies the IP address of the next-hop router for a route?

1. AS_PATH
   2. NEXT_HOP
   3. MED
   4. Origin

Correct Answer: 2. NEXT_HOP

Explanation:

The BGP NEXT_HOP attribute identifies the IP address that should be used as the next hop toward the advertised destination. A BGP route generally cannot be used for forwarding if its next hop is unreachable. When troubleshooting BGP, administrators should therefore verify both the route itself and reachability to its NEXT_HOP address. AS_PATH records autonomous systems traversed, MED can influence the preferred entry point, and Origin describes how the route entered BGP. NEXT_HOP is directly associated with the forwarding path toward the destination.

Question: 295. Which IPv4 private address range is defined as 192.168.0.0/16?

1. A publicly routable address block
   2. A multicast address block
   3. An RFC 1918 private address block
   4. A loopback address block

Correct Answer: 3. An RFC 1918 private address block

Explanation:

The 192.168.0.0/16 range is one of the three RFC 1918 private IPv4 address ranges. It is commonly used for internal networks, home networks, enterprise LANs, and other environments where addresses do not need to be globally routable. The other RFC 1918 ranges are 10.0.0.0/8 and 172.16.0.0/12. Private addresses normally require mechanisms such as NAT when hosts using them need to communicate with destinations on the public Internet. They should not be treated as globally routable public addresses.

Question: 296. Which OSPF state generally indicates that routers have established full database synchronization?

1. Full
   2. Init
   3. ExStart
   4. 2-Way

Correct Answer: 1. Full

Explanation:

The OSPF Full state indicates that the routers have completed the database synchronization process for the adjacency. At this stage, the routers have exchanged the required link-state information and have synchronized their applicable link-state databases. Init and 2-Way occur earlier in neighbor establishment, while ExStart is involved in negotiating master-slave behavior and Database Description exchange. Reaching Full is therefore an important operational milestone when verifying that an OSPF adjacency has formed correctly.

Question: 297. Which Junos command can be used to verify whether the device has active system alarms?

1. show system alarms
   2. show route
   3. show configuration
   4. show interfaces terse

Correct Answer: 1. show system alarms

Explanation:

The show system alarms command displays active alarms on the Junos device. These alarms can provide information about hardware, environmental, or system conditions requiring attention. It is useful during troubleshooting when administrators need to determine whether the device is reporting an active fault or abnormal condition. show route provides routing information, show configuration displays configuration, and show interfaces terse summarizes interface status. Checking alarms can help distinguish routing or configuration issues from underlying system or hardware conditions.

Question: 298. Which protocol is used to dynamically negotiate link aggregation between Ethernet devices?

1. VRRP
   2. LACP
   3. OSPF
   4. BFD

Correct Answer: 2. LACP

Explanation:

Link Aggregation Control Protocol (LACP) is used to dynamically negotiate and maintain aggregated Ethernet links between compatible devices. It allows multiple physical Ethernet interfaces to operate as a logical aggregated connection while helping ensure that participating links are properly coordinated. VRRP provides gateway redundancy, OSPF provides dynamic routing, and BFD provides rapid failure detection. LACP is therefore the protocol associated specifically with negotiating and maintaining link aggregation.

Question: 299. Which BGP path attribute is primarily used for loop prevention between autonomous systems?

1. Local Preference
   2. Origin
   3. MED
   4. AS_PATH

Correct Answer: 4. AS_PATH

Explanation:

AS_PATH is a fundamental BGP attribute used for loop prevention between autonomous systems. Each AS normally adds its own AS number when advertising a route through eBGP. If a router receives a route containing its own AS number in the AS_PATH, it can reject the route because the advertisement has already passed through that AS. AS_PATH also participates in route selection, where a shorter path is generally preferred when applicable. Local Preference, MED, and Origin serve different path-selection or policy functions.

Question: 300. Which Junos command provides a summary of BGP peer sessions and their states?

1. show ospf neighbor
   2. show route protocol bgp
   3. show bgp summary
   4. show interfaces terse

Correct Answer: 3. show bgp summary

Explanation:

The show bgp summary command provides a concise operational overview of BGP peer sessions. It can display information such as configured peers, peer AS numbers, session states, and route statistics. It is commonly used to quickly determine whether BGP sessions are established and whether expected routes are being received. show route protocol bgp focuses on BGP-learned routes in the routing table, while show ospf neighbor and show interfaces terse provide information about OSPF relationships and interface status respectively.