Juniper JN0-364\u00a0 Exam Dumps<\/b><\/a> and Practice Test Dumps<\/b><\/p>\n <\/p>\n
Question: 161. Which Junos command displays OSPF link-state database information?<\/b><\/p>\n\n- <\/b> show ospf database<\/span>
\n<\/span>2.<\/b> show bgp summary<\/span>
\n<\/span>3.<\/b> show route forwarding-table<\/span>
\n<\/span>4.<\/b> show ethernet-switching table<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 1. <\/span>show ospf database<\/span><\/p>\nExplanation:<\/b><\/p>\n
The <\/span>show ospf database<\/span> command displays the OSPF link-state database, including information about LSAs learned and originated by the router. The database represents the topology information that OSPF routers use to calculate shortest paths. Examining the database is useful when troubleshooting missing routes, unexpected topology information, or LSA propagation problems. Commands such as <\/span>show bgp summary<\/span> and <\/span>show ethernet-switching table<\/span> focus on different protocols or functions and do not display the OSPF link-state database.<\/span><\/p>\nQuestion: 162. Which BGP attribute is generally preferred when its value is higher during path selection?<\/b><\/p>\n\n- <\/b> MED<\/span>
\n<\/span>2.<\/b> Local Preference<\/span>
\n<\/span>3.<\/b> AS_PATH length<\/span>
\n<\/span>4.<\/b> Origin<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 2. Local Preference<\/span><\/p>\nExplanation:<\/b><\/p>\n
Local Preference is a BGP attribute for influencing outbound path selection within an autonomous system, and a higher value is generally preferred. Administrators can assign different Local Preference values to routes learned through different external connections to control which exit point is selected. This attribute is propagated through iBGP so that multiple routers can follow a consistent outbound routing preference. MED differs because a lower MED is generally preferred when the relevant comparison applies.<\/span><\/p>\nQuestion: 163. Which IPv4 prefix represents the private address range 192.168.0.0 through 192.168.255.255?<\/b><\/p>\n\n- <\/b> 172.16.0.0\/12<\/span>
\n<\/span>2.<\/b> 10.0.0.0\/8<\/span>
\n<\/span>3.<\/b> 192.168.0.0\/16<\/span>
\n<\/span>4.<\/b> 169.254.0.0\/16<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 3. <\/span>192.168.0.0\/16<\/span><\/p>\nExplanation:<\/b><\/p>\n
The <\/span>192.168.0.0\/16<\/span> prefix is an RFC 1918 private IPv4 address range. It includes addresses from 192.168.0.0 through 192.168.255.255 and is commonly used in residential, enterprise, and laboratory networks. Private addresses are not intended to be directly routed across the public Internet. The other RFC 1918 private ranges are <\/span>10.0.0.0\/8<\/span> and <\/span>172.16.0.0\/12<\/span>. The <\/span>169.254.0.0\/16<\/span> range is used for IPv4 link-local addressing rather than RFC 1918 private addressing.<\/span><\/p>\nQuestion: 164. What is the primary purpose of BGP route filtering through routing policy?<\/b><\/p>\n\n- <\/b> To control which routes are accepted or advertised<\/span>
\n<\/span>2.<\/b> To calculate Ethernet frame checksums<\/span>
\n<\/span>3.<\/b> To assign IPv6 link-local addresses<\/span>
\n<\/span>4.<\/b> To elect an OSPF Designated Router<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 1. To control which routes are accepted or advertised<\/span><\/p>\nExplanation:<\/b><\/p>\n
Routing policies can control which BGP routes are accepted, rejected, modified, or advertised to other peers. Policies can match prefixes, communities, AS paths, protocol attributes, and other route characteristics and then apply appropriate actions. This allows administrators to implement routing controls without relying solely on the default behavior of BGP. Routing policy is therefore an important tool for managing route propagation, traffic engineering, and routing security.<\/span><\/p>\nQuestion: 165. Which OSPF neighbor state occurs after successful database synchronization?<\/b><\/p>\n\n- <\/b> Init<\/span>
\n<\/span>2.<\/b> Exchange<\/span>
\n<\/span>3.<\/b> Full<\/span>
\n<\/span>4.<\/b> Down<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 3. Full<\/span><\/p>\nExplanation:<\/b><\/p>\n
The OSPF Full state indicates that neighboring routers have completed the required database synchronization and have matching link-state information for the adjacency. This is the normal fully established state for routers that need a full adjacency. Earlier states include Down, Init, 2-Way, ExStart, and Exchange. If an adjacency remains stuck in a state such as ExStart or Exchange, troubleshooting may involve checking MTU values, network types, timers, router IDs, and other configuration parameters.<\/span><\/p>\nQuestion: 166. Which Junos command provides a concise view of interface operational and administrative status?<\/b><\/p>\n\n- <\/b> show interfaces terse<\/span>
\n<\/span>2.<\/b> show route detail<\/span>
\n<\/span>3.<\/b> show ospf database<\/span>
\n<\/span>4.<\/b> show system alarms<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 1. <\/span>show interfaces terse<\/span><\/p>\nExplanation:<\/b><\/p>\n
The <\/span>show interfaces terse<\/span> command provides a concise summary of interface information, including administrative and operational states and addressing information where applicable. It is especially useful as a quick first step when checking whether an interface is physically and logically operational. The detailed <\/span>show interfaces<\/span> command provides substantially more information, while routing and system commands focus on other areas. Checking interface state is often essential before troubleshooting higher-level routing protocols.<\/span><\/p>\nQuestion: 167. Which protocol uses a hop-count metric and considers 15 hops the maximum reachable distance?<\/b><\/p>\n\n- <\/b> OSPF<\/span>
\n<\/span>2.<\/b> RIP<\/span>
\n<\/span>3.<\/b> BGP<\/span>
\n<\/span>4.<\/b> IS-IS<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 2. RIP<\/span><\/p>\nExplanation:<\/b><\/p>\n
RIP is a distance-vector routing protocol that uses hop count as its routing metric. A route with 1 through 15 hops can be considered reachable, while 16 represents an unreachable destination. This relatively small maximum makes RIP unsuitable for many large modern networks. OSPF and IS-IS use link-state calculations, while BGP uses a path-vector approach with multiple attributes for route selection. RIP’s simple metric is one of its defining characteristics.<\/span><\/p>\nQuestion: 168. Which BGP mechanism helps prevent routing loops between autonomous systems?<\/b><\/p>\n\n- <\/b> AS_PATH loop detection<\/span>
\n<\/span>2.<\/b> OSPF DR election<\/span>
\n<\/span>3.<\/b> LACP negotiation<\/span>
\n<\/span>4.<\/b> IPv6 SLAAC<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 1. AS_PATH loop detection<\/span><\/p>\nExplanation:<\/b><\/p>\n
BGP uses the AS_PATH attribute as an important mechanism for preventing routing loops. When a route is advertised through eBGP, the advertising router normally adds its autonomous system number to the AS_PATH. If a router receives a route advertisement containing its own AS number, it can recognize that the route has already traversed its autonomous system and reject it as a loop. This mechanism is fundamental to the scalability and stability of inter-domain BGP routing.<\/span><\/p>\nQuestion: 169. Which IPv6 feature automatically detects whether an address is already in use on a local link?<\/b><\/p>\n\n- <\/b> MED<\/span>
\n<\/span>2.<\/b> Duplicate Address Detection<\/span>
\n<\/span>3.<\/b> Route reflection<\/span>
\n<\/span>4.<\/b> LACP<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 2. Duplicate Address Detection<\/span><\/p>\nExplanation:<\/b><\/p>\n
IPv6 Duplicate Address Detection, or DAD, is part of Neighbor Discovery and is used to determine whether an address is already in use before an interface begins using it. The process uses ICMPv6 Neighbor Solicitation and Neighbor Advertisement behavior. DAD helps prevent two interfaces on the same link from unintentionally using the same IPv6 address. It is an IPv6 host and interface function rather than a BGP, OSPF, or Ethernet link-aggregation feature.<\/span><\/p>\nQuestion: 170. Which Junos configuration command is commonly used to verify that a candidate configuration has no syntax or structural errors before committing?<\/b><\/p>\n\n- <\/b> commit check<\/span>
\n<\/span>2.<\/b> show route<\/span>
\n<\/span>3.<\/b> show interfaces terse<\/span>
\n<\/span>4.<\/b> rollback 0<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 1. <\/span>commit check<\/span><\/p>\nExplanation:<\/b><\/p>\n
The <\/span>commit check<\/span> command validates the candidate configuration without activating it as the committed configuration. It is useful before committing changes because it can identify configuration syntax, hierarchy, or other validation problems. A successful <\/span>commit check<\/span> does not itself make the candidate configuration active. An administrator can then use <\/span>commit<\/span> to activate the validated configuration. This workflow provides a useful safeguard when making significant Junos configuration changes.<\/span><\/p>\nQuestion: 171. Which OSPF LSA is generated by an ABR to advertise networks from one OSPF area into another?<\/b><\/p>\n\n- <\/b> Type 5<\/span>
\n<\/span>2.<\/b> Type 2<\/span>
\n<\/span>3.<\/b> Type 3<\/span>
\n<\/span>4.<\/b> Type 1<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 3. Type 3<\/span><\/p>\nExplanation:<\/b><\/p>\n
OSPF Type 3 Summary LSAs are generated by Area Border Routers to advertise inter-area network information. They allow routers in one OSPF area to learn about networks located in another area. Type 1 Router LSAs describe individual routers within an area, Type 2 Network LSAs describe multi-access networks through the DR, and Type 5 LSAs advertise external routes. Understanding the LSA types is important for troubleshooting inter-area and external OSPF routing behavior.<\/span><\/p>\nQuestion: 172. Which BGP attribute identifies the next-hop IP address that should be used to reach a route?<\/b><\/p>\n\n