Juniper JN0-364\u00a0 Exam Dumps<\/b><\/a> and Practice Test Dumps<\/b><\/p>\n <\/p>\n
Question: 1. In OSPF, which LSA type is used by a router to describe its directly connected links within an area?<\/b><\/p>\n\n- <\/b> Type 3 LSA<\/span>
\n<\/span>2.<\/b> Type 1 LSA<\/span>
\n<\/span>3.<\/b> Type 5 LSA<\/span>
\n<\/span>4.<\/b> Type 7 LSA<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 2. Type 1 LSA<\/span><\/p>\nExplanation:<\/b><\/p>\n
A Type 1 LSA, also called a Router LSA, is originated by every OSPF router and describes the router’s links, interfaces, neighbors, and associated link costs within an OSPF area. These LSAs are flooded throughout their originating area and form an important part of the link-state database used to calculate shortest paths. Type 3 LSAs are generated by ABRs to advertise networks between areas, while Type 5 LSAs carry external routes. Type 7 LSAs are used in NSSAs to represent external routes before they can be translated by an ABR. Understanding LSA roles is essential when troubleshooting OSPF topology and route propagation.<\/span><\/p>\nQuestion: 2. Which BGP attribute is primarily used to influence the preferred exit point from an autonomous system when multiple external routes are available?<\/b><\/p>\n\n- <\/b> MED<\/span>
\n<\/span>2.<\/b> Local preference<\/span>
\n<\/span>3.<\/b> Origin<\/span>
\n<\/span>4.<\/b> AS path<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 2. Local preference<\/span><\/p>\nExplanation:<\/b><\/p>\n
Local preference is a BGP attribute used within an autonomous system to influence which exit point should be preferred for outbound traffic. A higher local-preference value is preferred over a lower value. Because local preference is propagated to internal BGP peers, it can consistently influence routing decisions throughout the AS. MED serves a different purpose and is generally used to suggest an entry point into an AS from a neighboring AS. AS path length is also considered during BGP route selection, but it does not provide the same internal exit-control function as local preference.<\/span><\/p>\nQuestion: 3. Which protocol is designed specifically to provide link-state routing for IP networks and uses a two-level hierarchy of Level 1 and Level 2 routers?<\/b><\/p>\n\n- <\/b> IS-IS<\/span>
\n<\/span>2.<\/b> RIP<\/span>
\n<\/span>3.<\/b> BGP<\/span>
\n<\/span>4.<\/b> OSPF<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 1. IS-IS<\/span><\/p>\nExplanation:<\/b><\/p>\n
IS-IS is a link-state interior gateway protocol that uses a hierarchical design based on Level 1 and Level 2 routing. Level 1 routers primarily route within an IS-IS area, while Level 2 routers provide connectivity between areas. A router can operate as both Level 1 and Level 2. IS-IS builds a link-state database and uses the Shortest Path First algorithm to calculate routes. Unlike OSPF, IS-IS runs directly over Layer 2 rather than using IP as its transport protocol. These characteristics make IS-IS particularly important in large-scale service-provider environments.<\/span><\/p>\nQuestion: 4. What is the primary purpose of the OSPF designated router (DR) on a broadcast network?<\/b><\/p>\n\n- <\/b> Assign IP addresses to OSPF neighbors<\/span>
\n<\/span>2.<\/b> Replace the OSPF shortest-path calculation<\/span>
\n<\/span>3.<\/b> Provide default routing for all OSPF routers<\/span>
\n<\/span>4.<\/b> Reduce the number of OSPF adjacencies required on the segment<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 4. Reduce the number of OSPF adjacencies required on the segment<\/span><\/p>\nExplanation:<\/b><\/p>\n
On broadcast multiaccess networks such as Ethernet, OSPF elects a designated router to reduce the number of full adjacencies that must be established. Without a DR, every router would need to form a full adjacency with every other router on the segment, creating a large number of relationships. Routers instead establish full adjacency with the DR and backup designated router, while other relationships are handled through the DR mechanism. The DR also originates a Type 2 Network LSA representing the multiaccess segment. This design significantly reduces OSPF flooding and adjacency overhead.<\/span><\/p>\nQuestion: 5. Which IPv6 routing protocol is the IPv6 version of OSPF and uses IPv6 link-local addresses for neighbor relationships?<\/b><\/p>\n\n- <\/b> OSPFv3<\/span>
\n<\/span>2.<\/b> OSPFv2<\/span>
\n<\/span>3.<\/b> RIPv2<\/span>
\n<\/span>4.<\/b> BGP-4<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 1. OSPFv3<\/span><\/p>\nExplanation:<\/b><\/p>\n
OSPFv3 is the version of OSPF designed for IPv6 networks. OSPFv3 uses IPv6 link-local addresses for neighbor communication and relies on IPv6 protocol mechanisms rather than IPv4 addressing. The underlying link-state routing concepts remain familiar, including areas, LSAs, SPF calculations, and designated-router operation on broadcast networks. OSPFv2 is designed for IPv4. Although BGP can carry IPv6 reachability information through appropriate address families, it is not an IPv6-specific replacement for OSPF. When troubleshooting OSPFv3, verifying link-local connectivity, neighbor state, area configuration, and interface participation is important.<\/span><\/p>\nQuestion: 6. In BGP, what does the AS path attribute primarily provide?<\/b><\/p>\n\n- <\/b> The router’s interface bandwidth<\/span>
\n<\/span>2.<\/b> The number of active interfaces on a router<\/span>
\n<\/span>3.<\/b> The OSPF area associated with a route<\/span>
\n<\/span>4.<\/b> The sequence of autonomous systems through which a route has passed<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 4. The sequence of autonomous systems through which a route has passed<\/span><\/p>\nExplanation:<\/b><\/p>\n
The AS path attribute records the sequence of autonomous systems through which a BGP route advertisement has traveled. It serves an important role in BGP route selection and loop prevention. When an external BGP route is advertised into another autonomous system, the advertising AS normally adds its AS number to the AS path. If a router receives a route containing its own AS number in the path, it can reject the route to prevent an inter-AS routing loop. AS path length can also influence BGP route selection, although it is only one of several attributes considered during the decision process.<\/span><\/p>\nQuestion: 7. Which Junos feature allows multiple physical Ethernet links to operate together as a single logical interface for increased capacity and redundancy?<\/b><\/p>\n\n- <\/b> VRRP<\/span>
\n<\/span>2.<\/b> Link aggregation<\/span>
\n<\/span>3.<\/b> Graceful restart<\/span>
\n<\/span>4.<\/b> BFD<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 2. Link aggregation<\/span><\/p>\nExplanation:<\/b><\/p>\n
Link aggregation combines multiple physical Ethernet interfaces into a logical aggregated interface. This arrangement can provide increased aggregate bandwidth as well as redundancy because traffic can continue using remaining member links if one physical connection fails. On Junos devices, aggregated Ethernet interfaces are commonly used to connect switches, routers, and servers where higher availability or capacity is required. VRRP provides first-hop gateway redundancy, BFD detects forwarding failures rapidly, and graceful restart helps preserve routing during certain control-plane events. These technologies can complement link aggregation but perform different functions within a network.<\/span><\/p>\nQuestion: 8. What is the primary function of Bidirectional Forwarding Detection (BFD)?<\/b><\/p>\n\n- <\/b> Exchange routing policies between autonomous systems<\/span>
\n<\/span>2.<\/b> Assign addresses to IPv6 interfaces<\/span>
\n<\/span>3.<\/b> Detect forwarding-path failures rapidly<\/span><\/li>\n- <\/b> Encrypt routing protocol traffic<\/span><\/li>\n<\/ol>\n
Correct Answer:<\/b> 3. Detect forwarding-path failures rapidly<\/span><\/p>\nExplanation:<\/b><\/p>\n
BFD is designed to provide rapid detection of forwarding-path failures between network devices. It uses lightweight control packets exchanged between participating systems and can detect failures much faster than waiting for normal routing-protocol timers to expire. BFD can be integrated with protocols such as OSPF, IS-IS, and BGP so that a detected failure can trigger faster routing convergence. BFD does not replace the routing protocol itself and does not provide encryption. Its purpose is failure detection, allowing the associated routing protocol or service to react quickly when connectivity is lost.<\/span><\/p>\nQuestion: 9. Which mechanism allows IPv6 hosts to automatically configure addresses using router advertisements without requiring a DHCPv6 server for address assignment?<\/b><\/p>\n\n- <\/b> SLAAC<\/span>
\n<\/span>2.<\/b> ARP<\/span>
\n<\/span>3.<\/b> NAT64<\/span>
\n<\/span>4.<\/b> STP<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 1. SLAAC<\/span><\/p>\nExplanation:<\/b><\/p>\n
Stateless Address Autoconfiguration, or SLAAC, allows IPv6 hosts to automatically configure their addresses based on information received through Router Advertisement messages. A router advertises an IPv6 prefix, and the host uses that information to construct an address according to the applicable IPv6 addressing mechanism. SLAAC can operate without a DHCPv6 server being responsible for assigning the address itself. ARP is an IPv4 mechanism and is replaced by Neighbor Discovery in IPv6. NAT64 provides IPv6-to-IPv4 translation, while STP is a Layer 2 loop-prevention technology unrelated to IPv6 address configuration.<\/span><\/p>\nQuestion: 10. What is the main purpose of GRE tunneling?<\/b><\/p>\n\n- <\/b> Encapsulate one network protocol inside another IP packet<\/span>
\n<\/span>2.<\/b> Provide Ethernet switching between VLANs<\/span>
\n<\/span>3.<\/b> Assign IPv4 addresses dynamically<\/span>
\n<\/span>4.<\/b> Replace BGP route advertisements<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 1. Encapsulate one network protocol inside another IP packet<\/span><\/p>\nExplanation:<\/b><\/p>\n
Generic Routing Encapsulation, or GRE, creates a logical tunnel by encapsulating an original packet inside another IP packet. This allows traffic to traverse an intermediate IP network as if it were being transported through a logical point-to-point connection. GRE can be used for connecting networks, carrying routing protocols across an IP infrastructure, or creating logical paths between endpoints. GRE itself does not provide encryption, so additional security mechanisms may be required when confidentiality is necessary. GRE troubleshooting commonly involves checking tunnel endpoint reachability, routing to the tunnel endpoints, tunnel status, and the routes using the tunnel.<\/span><\/p>\nQuestion: 11. Which BGP attribute is commonly used to indicate a preferred path for traffic entering an autonomous system from an external neighbor?<\/b><\/p>\n\n- <\/b> Local preference<\/span>
\n<\/span>2.<\/b> Origin<\/span>
\n<\/span>3.<\/b> MED<\/span>
\n<\/span>4.<\/b> Router ID<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 3. MED<\/span><\/p>\nExplanation:<\/b><\/p>\n
The Multi-Exit Discriminator, or MED, can be used by one autonomous system to indicate a preferred entry point for traffic entering that autonomous system from a neighboring autonomous system. In general, a lower MED is preferred when comparing otherwise eligible routes from the same neighboring AS. MED is therefore useful when an organization has multiple connections to the same external AS and wants to influence which connection that neighbor uses. MED should not be confused with local preference, which is primarily used internally to influence outbound path selection. Actual BGP selection behavior depends on the complete route-selection process and configuration.<\/span><\/p>\nQuestion: 12. Which OSPF area type is designed to prevent external Type 5 LSAs from being flooded into the area?<\/b><\/p>\n\n- <\/b> Backbone area<\/span>
\n<\/span>2.<\/b> Stub area<\/span>
\n<\/span>3.<\/b> Transit area<\/span>
\n<\/span>4.<\/b> Standard area<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 2. Stub area<\/span><\/p>\nExplanation:<\/b><\/p>\n
An OSPF stub area is designed to reduce the amount of external routing information that must be carried inside the area. Type 5 LSAs, which represent external routes, are not flooded into a traditional stub area. Instead, a default route can be advertised by the ABR so that routers inside the stub area can reach destinations outside the area without maintaining detailed external route information. Stub areas are therefore useful when detailed external routing information is unnecessary. Other specialized area types, such as totally stubby areas and NSSAs, provide different behaviors for controlling inter-area and external routing information.<\/span><\/p>\nQuestion: 13. In Junos, which routing table is normally used for IPv4 unicast routes?<\/b><\/p>\n\n- <\/b> inet.0<\/span>
\n<\/span>2.<\/b> inet6.0<\/span>
\n<\/span>3.<\/b>