Juniper JN0-364\u00a0 Exam Dumps<\/b><\/a> and Practice Test Dumps<\/b><\/p>\n <\/p>\n
Question: 81. Which Junos command can be used to display the routing table for IPv6 unicast routes?<\/b><\/p>\n\n- <\/b> show route table inet6.0<\/span>
\n<\/span>2.<\/b> show route table inet.0<\/span>
\n<\/span>3.<\/b> show arp<\/span>
\n<\/span>4.<\/b> show ethernet-switching table<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 1. show route table inet6.0<\/span><\/p>\nExplanation:<\/b><\/p>\n
The <\/span>inet6.0<\/span> routing table is the primary Junos routing table for IPv6 unicast routes. The command <\/span>show route table inet6.0<\/span> allows an administrator to examine routes installed in that table, including routes learned through connected interfaces, static configuration, OSPFv3, BGP, and other supported routing mechanisms. The <\/span>inet.0<\/span> table is used for IPv4 unicast routes. The ARP table is associated with IPv4 neighbor resolution, while the Ethernet switching table contains Layer 2 MAC-learning information. Knowing which routing table contains a particular address family is useful when troubleshooting IPv4 and IPv6 forwarding.<\/span><\/p>\nQuestion: 82. Which OSPF packet type is primarily responsible for establishing and maintaining neighbor relationships?<\/b><\/p>\n\n- <\/b> Link-State Update<\/span>
\n<\/span>2.<\/b> Database Description<\/span>
\n<\/span>3.<\/b> Hello<\/span>
\n<\/span>4.<\/b> Link-State Request<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 3. Hello<\/span><\/p>\nExplanation:<\/b><\/p>\n
OSPF Hello packets are used to discover neighboring routers and maintain OSPF neighbor relationships. They are sent periodically through participating interfaces and contain information that allows routers to verify compatible parameters and establish bidirectional communication. If expected Hello packets stop arriving for the configured dead interval, the neighbor can be declared down. Database Description packets are used during database synchronization, Link-State Requests ask for specific LSAs, and Link-State Updates carry LSAs. Therefore, when troubleshooting an OSPF adjacency that does not form, checking Hello exchange and matching interface parameters is an important first step.<\/span><\/p>\nQuestion: 83. Which BGP attribute is generally used to identify the preferred path for traffic leaving an autonomous system?<\/b><\/p>\n\n- <\/b> MED<\/span>
\n<\/span>2.<\/b> Local preference<\/span>
\n<\/span>3.<\/b> Origin<\/span>
\n<\/span>4.<\/b> Community<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 2. Local preference<\/span><\/p>\nExplanation:<\/b><\/p>\n
Local preference is commonly used to influence outbound traffic within an autonomous system. When multiple eligible BGP routes exist toward the same destination, a higher local-preference value is generally preferred. Because local preference is distributed through iBGP, it can help an organization establish a consistent preferred exit point across multiple routers. MED is more commonly associated with influencing how a neighboring AS enters the local AS, while origin and community have different roles. Routing policies can be used to assign or modify local preference based on prefixes, peers, communities, or other routing characteristics.<\/span><\/p>\nQuestion: 84. What is the primary purpose of the BGP NEXT_HOP attribute?<\/b><\/p>\n\n- <\/b> Identify the OSPF area containing the destination<\/span>
\n<\/span>2.<\/b> Specify the IP address that should be used as the next forwarding hop toward the advertised destination<\/span>
\n<\/span>3.<\/b> Define the BGP autonomous system number<\/span>
\n<\/span>4.<\/b> Indicate the route’s MED value<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 2. Specify the IP address that should be used as the next forwarding hop toward the advertised destination<\/span><\/p>\nExplanation:<\/b><\/p>\n
The BGP NEXT_HOP attribute identifies the IP address that a router should use as the next hop when forwarding traffic toward a BGP destination. A BGP route can be present in the routing table but still be unusable if the next hop cannot be resolved through the appropriate routing information. This makes next-hop reachability an important part of BGP troubleshooting. The AS path identifies autonomous systems traversed, MED is a path-selection attribute, and the OSPF area is unrelated to the NEXT_HOP attribute. Checking next-hop reachability can help explain why an apparently valid BGP route is not active.<\/span><\/p>\nQuestion: 85. Which Junos command is useful for displaying the current system uptime and basic system status?<\/b><\/p>\n\n- <\/b> show system uptime<\/span>
\n<\/span>2.<\/b> show route receive-protocol<\/span>
\n<\/span>3.<\/b> show ospf neighbor<\/span>
\n<\/span>4.<\/b> show interfaces extensive<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 1. show system uptime<\/span><\/p>\nExplanation:<\/b><\/p>\n
The <\/span>show system uptime<\/span> command provides information about how long the Junos device has been running and can also display related system-time information. This is useful when investigating recent reboots, system restarts, or unexpected control-plane events. Interface and routing commands provide much more specialized information. For example, <\/span>show interfaces extensive<\/span> gives detailed interface statistics, while OSPF and routing-protocol commands provide information about network operation. System uptime can also help correlate device events with monitoring alerts or configuration changes. It is a simple but useful command during initial troubleshooting.<\/span><\/p>\nQuestion: 86. Which routing protocol uses a link-state database and the SPF algorithm to calculate paths?<\/b><\/p>\n\n- <\/b> RIP<\/span>
\n<\/span>2.<\/b> BGP<\/span>
\n<\/span>3.<\/b> OSPF<\/span>
\n<\/span>4.<\/b> DHCP<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 3. OSPF<\/span><\/p>\nExplanation:<\/b><\/p>\n
OSPF is a link-state routing protocol that maintains a link-state database representing the topology of its routing area. It uses the Shortest Path First algorithm, based on Dijkstra’s algorithm, to calculate paths through that topology. Each router builds its own shortest-path tree and derives routing information from the resulting calculation. RIP uses a distance-vector approach, while BGP uses a path-vector model based on multiple route attributes. DHCP is not a routing protocol. Understanding OSPF’s link-state operation helps explain its neighbor relationships, LSAs, database synchronization, and route convergence behavior.<\/span><\/p>\nQuestion: 87. Which Junos command can be used to display detailed information about a BGP route, including its attributes and next hop?<\/b><\/p>\n\n- <\/b> show route protocol ospf<\/span>
\n<\/span>2.<\/b> show route detail<\/span>
\n<\/span>3.<\/b> show system users<\/span>
\n<\/span>4.<\/b> show interfaces terse<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 2. show route detail<\/span><\/p>\nExplanation:<\/b><\/p>\n
The <\/span>show route <prefix> detail<\/span> command can provide detailed information about a particular route, including its protocol source, preference, next hop, and relevant route attributes. This is especially useful when troubleshooting BGP because administrators may need to determine why a route was selected, rejected, or marked inactive. A more general routing-table display may not provide enough detail for complex route-selection problems. Interface and system-user commands address different operational areas. When investigating a specific destination, examining the detailed route entry can reveal important information about next-hop resolution and route selection.<\/span><\/p>\nQuestion: 88. Which protocol is commonly used by Junos devices to exchange routing information within an autonomous system when a hierarchical link-state design is desired?<\/b><\/p>\n\n- <\/b> SMTP<\/span>
\n<\/span>2.<\/b> BGP<\/span>
\n<\/span>3.<\/b> IS-IS<\/span>
\n<\/span>4.<\/b> FTP<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 3. IS-IS<\/span><\/p>\nExplanation:<\/b><\/p>\n
IS-IS is an interior gateway protocol that uses a link-state architecture and supports a hierarchical Level 1 and Level 2 design. It is commonly deployed within autonomous systems, particularly in large service-provider networks. Level 1 routing handles destinations within an area, while Level 2 provides connectivity between areas. BGP is primarily used for inter-AS routing, while SMTP and FTP are application-layer protocols unrelated to network routing. IS-IS also maintains a link-state database and uses SPF calculations, making it an important protocol to understand when studying large-scale Junos routing environments.<\/span><\/p>\nQuestion: 89. What is the main purpose of the OSPF designated router election on a broadcast network?<\/b><\/p>\n\n- <\/b> Assign IP addresses to hosts<\/span>
\n<\/span>2.<\/b> Encrypt OSPF messages<\/span>
\n<\/span>3.<\/b> Reduce the number of OSPF adjacencies and flooding relationships<\/span>
\n<\/span>4.<\/b> Select the default route for the network<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 3. Reduce the number of OSPF adjacencies and flooding relationships<\/span><\/p>\nExplanation:<\/b><\/p>\n
OSPF elects a designated router on broadcast multiaccess networks to reduce the number of full adjacencies and simplify link-state flooding. Without a DR, every OSPF router on the segment would potentially need a full relationship with every other router, increasing protocol overhead as the number of routers grows. The DR and backup designated router provide a more scalable mechanism for exchanging topology information. The DR election does not assign IP addresses, encrypt OSPF traffic, or automatically determine the default route. Understanding DR and BDR behavior is particularly important when troubleshooting OSPF on Ethernet segments.<\/span><\/p>\nQuestion: 90. Which IPv4 prefix represents the default route?<\/b><\/p>\n\n- <\/b> 127.0.0.0\/8<\/span>
\n<\/span>2.<\/b> 255.255.255.255\/32<\/span>
\n<\/span>3.<\/b> 224.0.0.0\/4<\/span>
\n<\/span>4.<\/b> 0.0.0.0\/0<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 4. 0.0.0.0\/0<\/span><\/p>\nExplanation:<\/b><\/p>\n
The IPv4 default route is represented by <\/span>0.0.0.0\/0<\/span>. It matches destinations for which the routing table contains no more-specific route. Because its prefix length is zero, it is less specific than every normal IPv4 route and therefore serves as a fallback path. It is commonly used on routers at network edges to forward unknown destinations toward an upstream router. <\/span>127.0.0.0\/8<\/span> is reserved for loopback addressing, <\/span>224.0.0.0\/4<\/span> is the IPv4 multicast range, and <\/span>255.255.255.255<\/span> is the limited broadcast address. Understanding prefix specificity is essential when analyzing default-route behavior.<\/span><\/p>\nQuestion: 91. Which Junos feature allows a router to keep forwarding traffic during certain Routing Engine control-plane transitions?<\/b><\/p>\n\n- <\/b> GRES<\/span>
\n<\/span>2.<\/b> LACP<\/span>
\n<\/span>3.<\/b> ARP<\/span>
\n<\/span>4.<\/b> Route reflection<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 1. GRES<\/span><\/p>\nExplanation:<\/b><\/p>\n
Graceful Routing Engine Switchover, or GRES, is a Junos high-availability feature designed for systems with redundant Routing Engines. During a Routing Engine switchover, GRES helps maintain packet forwarding through the forwarding plane while control transitions between Routing Engines. GRES should be distinguished from other high-availability mechanisms that synchronize routing-protocol state or application state. LACP provides link aggregation, ARP resolves IPv4 addresses to MAC addresses, and route reflection improves iBGP scalability. Understanding how GRES interacts with other redundancy features is important when designing resilient Junos platforms.<\/span><\/p>\nQuestion: 92. Which BGP community is commonly used to indicate that a route should not be advertised outside the local autonomous system?<\/b><\/p>\n\n- <\/b> internet<\/span>
\n<\/span>2.<\/b> no-export<\/span>
\n<\/span>3.<\/b>