Juniper JN0-364\u00a0 Exam Dumps<\/b><\/a> and Practice Test Dumps<\/b><\/p>\nQuestion: 321. Which OSPF mechanism is responsible for calculating the shortest path through the link-state database?<\/b><\/p>\n\n- <\/b> BGP path selection<\/span>
\n<\/span>2.<\/b> Dijkstra’s Shortest Path First algorithm<\/span>
\n<\/span>3.<\/b> LACP negotiation<\/span>
\n<\/span>4.<\/b> RIP hop-count calculation<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 2. Dijkstra’s Shortest Path First algorithm<\/span><\/p>\nExplanation:<\/b><\/p>\n
OSPF uses Dijkstra’s Shortest Path First (SPF) algorithm to calculate the shortest paths through its link-state database. Each router builds a topology view from LSAs and then runs SPF to determine the best paths to destinations. The resulting routes can be installed in the routing table. BGP uses a different path-selection process based on attributes, RIP uses hop count as its primary metric, and LACP negotiates link aggregation rather than calculating Layer 3 paths.<\/span><\/p>\nQuestion: 322. Which BGP attribute is generally preferred when comparing routes received from different external paths for outbound traffic within an autonomous system?<\/b><\/p>\n\n- <\/b> Local Preference<\/span>
\n<\/span>2.<\/b> MED<\/span>
\n<\/span>3.<\/b> AS_PATH<\/span>
\n<\/span>4.<\/b> Origin<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 1. Local Preference<\/span><\/p>\nExplanation:<\/b><\/p>\n
BGP Local Preference is used inside an autonomous system to influence the preferred exit point for outbound traffic. A higher Local Preference value is generally preferred when comparing eligible BGP routes. Network administrators commonly use routing policy to assign different Local Preference values to routes received from different external connections. MED instead provides information that can influence how a neighboring AS selects an entry point, while AS_PATH and Origin are different BGP path attributes used at other stages of route selection.<\/span><\/p>\nQuestion: 323. What is the primary purpose of an OSPF Designated Router on a broadcast multiaccess network?<\/b><\/p>\n\n- <\/b> To assign IPv4 addresses to hosts<\/span>
\n<\/span>2.<\/b> To replace the routing table<\/span>
\n<\/span>3.<\/b> To reduce the number of OSPF adjacencies and LSA flooding relationships<\/span>
\n<\/span>4.<\/b> To provide BGP route reflection<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 3. To reduce the number of OSPF adjacencies and LSA flooding relationships<\/span><\/p>\nExplanation:<\/b><\/p>\n
On broadcast multiaccess networks, OSPF elects a Designated Router (DR) to reduce the number of full adjacencies required between routers. Without a DR, every router could need a direct adjacency with every other router, creating significant overhead as the number of routers increases. The DR acts as a central point for certain OSPF database exchange and flooding operations. The Backup Designated Router (BDR) provides redundancy if the DR fails. DR functionality is specific to OSPF and is unrelated to BGP route reflection.<\/span><\/p>\nQuestion: 324. Which Junos routing table is normally used for IPv6 unicast routes?<\/b><\/p>\n\n- <\/b> inet.0<\/span>
\n<\/span>2.<\/b> inet6.0<\/span>
\n<\/span>3.<\/b> mpls.0<\/span>
\n<\/span>4.<\/b> iso.0<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 2. <\/span>inet6.0<\/span><\/p>\nExplanation:<\/b><\/p>\n
In Junos, the <\/span>inet6.0<\/span> routing table is the primary routing table for IPv6 unicast routes. The <\/span>inet.0<\/span> table is used for IPv4 unicast routes. Other routing tables are associated with different protocol families or forwarding functions. Understanding the distinction between <\/span>inet.0<\/span> and <\/span>inet6.0<\/span> is important when troubleshooting IPv4 and IPv6 routing because a route installed in one table does not automatically appear in the other.<\/span><\/p>\nQuestion: 325. Which protocol is commonly used to provide first-hop gateway redundancy between routers?<\/b><\/p>\n\n- <\/b> VRRP<\/span>
\n<\/span>2.<\/b> BFD<\/span>
\n<\/span>3.<\/b> LACP<\/span>
\n<\/span>4.<\/b> IS-IS<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 1. VRRP<\/span><\/p>\nExplanation:<\/b><\/p>\n
VRRP, or Virtual Router Redundancy Protocol, provides first-hop gateway redundancy by allowing multiple routers to participate in a virtual router group. Hosts can use a virtual IP address as their default gateway while one router performs the active forwarding role and another can take over if needed. BFD provides rapid failure detection, LACP provides link aggregation, and IS-IS is a link-state routing protocol. VRRP therefore addresses gateway availability rather than routing-protocol path calculation or physical-link aggregation.<\/span><\/p>\nQuestion: 326. Which BGP attribute records the sequence of autonomous systems through which a route advertisement has passed?<\/b><\/p>\n\n- <\/b> NEXT_HOP<\/span>
\n<\/span>2.<\/b> MED<\/span>
\n<\/span>3.<\/b> AS_PATH<\/span>
\n<\/span>4.<\/b> Local Preference<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 3. AS_PATH<\/span><\/p>\nExplanation:<\/b><\/p>\n
The AS_PATH attribute contains the sequence of autonomous system numbers that a BGP route advertisement has traversed. Besides providing path information, AS_PATH is an important loop-prevention mechanism. When a BGP router detects its own AS number in the path, it can reject the advertisement. AS_PATH length can also influence BGP path selection, with shorter paths generally preferred when other relevant factors are equal. NEXT_HOP identifies the next-hop address, MED influences certain inbound path decisions, and Local Preference influences outbound path selection within an AS.<\/span><\/p>\nQuestion: 327. Which Junos command is most useful for checking the operational status and brief details of all interfaces?<\/b><\/p>\n\n- <\/b> show route<\/span>
\n<\/span>2.<\/b> show interfaces terse<\/span>
\n<\/span>3.<\/b> show chassis hardware<\/span>
\n<\/span>4.<\/b> show system uptime<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 2. <\/span>show interfaces terse<\/span><\/p>\nExplanation:<\/b><\/p>\n
The <\/span>show interfaces terse<\/span> command provides a compact summary of interfaces and their operational and administrative states. It is particularly useful as a quick diagnostic tool for determining whether interfaces are up or down and for viewing protocol-family status. <\/span>show interfaces<\/span> provides much more detailed information for individual interfaces, while <\/span>show route<\/span> focuses on routing information. <\/span>show chassis hardware<\/span> displays hardware inventory and <\/span>show system uptime<\/span> provides system uptime information.<\/span><\/p>\nQuestion: 328. Which OSPF packet is primarily used to request specific LSAs that a router needs to complete database synchronization?<\/b><\/p>\n\n- <\/b> Hello<\/span>
\n<\/span>2.<\/b> Link-State Acknowledgment<\/span>
\n<\/span>3.<\/b> Database Description<\/span>
\n<\/span>4.<\/b> Link-State Request<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 4. Link-State Request<\/span><\/p>\nExplanation:<\/b><\/p>\n
An OSPF Link-State Request (LSR) packet is used when a router needs specific LSAs from a neighboring router during database synchronization. After comparing database information, a router can send an LSR for missing or newer LSAs. The neighbor responds with a Link-State Update containing the requested LSAs. Hello packets establish and maintain neighbor relationships, Database Description packets summarize database contents, and Link-State Acknowledgments confirm receipt of LSAs.<\/span><\/p>\nQuestion: 329. Which IPv6 address is the loopback address?<\/b><\/p>\n\n- <\/b> FE80::1<\/span>
\n<\/span>2.<\/b> FF02::1<\/span>
\n<\/span>3.<\/b> ::1<\/span>
\n<\/span>4.<\/b> 2001:db8::1<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 3. <\/span>::1<\/span><\/p>\nExplanation:<\/b><\/p>\n
The IPv6 loopback address is <\/span>::1<\/span>. It serves the same general purpose as the IPv4 loopback address <\/span>127.0.0.1<\/span>, allowing a device to send traffic to itself for local testing and communication. <\/span>FE80::\/10<\/span> is the IPv6 link-local range, while <\/span>FF00::\/8<\/span> is reserved for multicast addresses. <\/span>2001:db8::\/32<\/span> is reserved for documentation and examples. The loopback address is represented by a 128-bit address with all bits set to zero except the final bit.<\/span><\/p>\nQuestion: 330. Which BGP community is designed to prevent a route from being advertised outside the local autonomous system?<\/b><\/p>\n\n- <\/b> no-advertise<\/span>
\n<\/span>2.<\/b> internet<\/span>
\n<\/span>3.<\/b> no-export<\/span>
\n<\/span>4.<\/b> local-AS<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 3. no-export<\/span><\/p>\nExplanation:<\/b><\/p>\n
The BGP <\/span>no-export<\/span> community tells a BGP speaker that a route should not be advertised outside the local autonomous system, subject to the applicable BGP environment and policy. It is useful when a route should be shared within an AS but should not be propagated to external autonomous systems. <\/span>no-advertise<\/span> has a stricter scope because it prevents advertisement to any BGP peer. The <\/span>internet<\/span> community generally indicates that the route can be advertised to other BGP peers according to policy.<\/span><\/p>\nQuestion: 331. Which Junos command displays the forwarding table used to determine the next-hop forwarding behavior for packets?<\/b><\/p>\n\n- <\/b> show route forwarding-table<\/span>
\n<\/span>2.<\/b> show configuration<\/span>
\n<\/span>3.<\/b> show ospf database<\/span>
\n<\/span>4.<\/b>