Juniper JN0-364\u00a0 Exam Dumps<\/b><\/a> and Practice Test Dumps<\/b><\/p>\nQuestion: 261. Which Junos command displays routes learned specifically through BGP?<\/b><\/p>\n\n- <\/b> show route protocol bgp<\/span>
\n<\/span>2.<\/b> show route forwarding-table<\/span>
\n<\/span>3.<\/b> show bgp summary<\/span>
\n<\/span>4.<\/b> show ospf neighbor<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 1. <\/span>show route protocol bgp<\/span><\/p>\nExplanation:<\/b><\/p>\n
The <\/span>show route protocol bgp<\/span> command filters the Junos routing table to display routes whose protocol source is BGP. This is useful when verifying whether BGP-learned prefixes have been installed in the routing table. <\/span>show bgp summary<\/span> provides information about BGP sessions and peer statistics, but it does not provide the same route-focused view. <\/span>show route forwarding-table<\/span> examines the forwarding table, while <\/span>show ospf neighbor<\/span> is used for OSPF adjacency information. Filtering routes by protocol is an effective way to troubleshoot route learning and installation.<\/span><\/p>\nQuestion: 262. What is the primary purpose of OSPF SPF calculation?<\/b><\/p>\n\n- <\/b> To negotiate Ethernet aggregation<\/span>
\n<\/span>2.<\/b> To calculate the shortest paths through the OSPF topology<\/span>
\n<\/span>3.<\/b> To assign IPv6 addresses<\/span>
\n<\/span>4.<\/b> To establish BGP TCP sessions<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 2. To calculate the shortest paths through the OSPF topology<\/span><\/p>\nExplanation:<\/b><\/p>\n
OSPF uses the Shortest Path First (SPF) algorithm to calculate the shortest paths through the topology represented in its link-state database. Each router builds a view of the network topology from received LSAs and then calculates the best paths to reachable destinations. The resulting routes can be installed in the routing table. Ethernet aggregation is handled by mechanisms such as LACP, IPv6 address assignment can use mechanisms such as SLAAC, and BGP establishes its own TCP sessions. SPF is therefore central to OSPF route calculation.<\/span><\/p>\nQuestion: 263. Which BGP attribute is normally preferred when it has a higher value?<\/b><\/p>\n\n- <\/b> MED<\/span>
\n<\/span>2.<\/b> AS_PATH length<\/span>
\n<\/span>3.<\/b> Local Preference<\/span>
\n<\/span>4.<\/b> Origin type<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 3. Local Preference<\/span><\/p>\nExplanation:<\/b><\/p>\n
BGP generally prefers a higher Local Preference value when selecting among otherwise eligible paths within an autonomous system. Administrators can use Local Preference to influence which exit point is preferred for outbound traffic. MED generally favors a lower value, while a shorter AS_PATH is generally preferred over a longer path. Origin is also considered during BGP path selection but is not normally interpreted as a simple higher-is-better numeric attribute. Local Preference is therefore a key tool for controlling outbound traffic decisions across an autonomous system.<\/span><\/p>\nQuestion: 264. Which IPv4 address is the limited broadcast address?<\/b><\/p>\n\n- <\/b> 0.0.0.0<\/span>
\n<\/span>2.<\/b> 127.0.0.1<\/span>
\n<\/span>3.<\/b> 224.0.0.1<\/span>
\n<\/span>4.<\/b> 255.255.255.255<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 4. 255.255.255.255<\/span><\/p>\nExplanation:<\/b><\/p>\n
The IPv4 address 255.255.255.255 represents the limited broadcast address. Packets sent to this address are intended for all IPv4 hosts on the local broadcast domain and are not routed by routers to other networks. The address 0.0.0.0 has several special uses, including representing an unspecified address and the destination in a default route when used with a \/0 prefix. 127.0.0.1 is the IPv4 loopback address, while 224.0.0.1 is an IPv4 multicast address representing all hosts on the local subnet.<\/span><\/p>\nQuestion: 265. Which Junos command is useful for displaying the status of all configured interfaces in a compact format?<\/b><\/p>\n\n- <\/b> show system alarms<\/span>
\n<\/span>2.<\/b> show interfaces terse<\/span>
\n<\/span>3.<\/b> show route<\/span>
\n<\/span>4.<\/b> show configuration<\/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 concise summary of configured interfaces and their administrative and operational states. It is commonly used as an initial troubleshooting command because it quickly shows whether interfaces are up or down and can also display address information. The full <\/span>show interfaces<\/span> command provides much more detailed operational information. <\/span>show system alarms<\/span> reports alarms, <\/span>show route<\/span> displays routing information, and <\/span>show configuration<\/span> displays configuration hierarchy. The terse interface view is therefore useful for quickly assessing overall interface status.<\/span><\/p>\nQuestion: 266. Which BGP mechanism allows multiple equal-cost paths to be installed for forwarding?<\/b><\/p>\n\n- <\/b> Route reflection<\/span>
\n<\/span>2.<\/b> Communities<\/span>
\n<\/span>3.<\/b> BGP multipath<\/span>
\n<\/span>4.<\/b> MED<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 3. BGP multipath<\/span><\/p>\nExplanation:<\/b><\/p>\n
BGP multipath allows multiple eligible BGP paths to be installed in the forwarding table when they meet the configured requirements for multipath selection. This can provide load sharing across multiple paths and improve redundancy. Route reflection is designed to reduce the need for a full iBGP mesh, while communities provide policy information that can be used to control route handling. MED can influence path selection between autonomous systems but does not itself enable multipath forwarding. BGP multipath therefore addresses the use of multiple qualifying paths for forwarding.<\/span><\/p>\nQuestion: 267. Which OSPF packet type is responsible for acknowledging received LSAs?<\/b><\/p>\n\n- <\/b> Link-State Acknowledgment<\/span>
\n<\/span>2.<\/b> Database Description<\/span>
\n<\/span>3.<\/b> Link-State Request<\/span>
\n<\/span>4.<\/b> Hello<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 1. Link-State Acknowledgment<\/span><\/p>\nExplanation:<\/b><\/p>\n
OSPF Link-State Acknowledgment (LSAck) packets are used to acknowledge receipt of link-state advertisements. Reliable LSA flooding is important because routers need synchronized link-state databases to calculate consistent paths. Database Description packets exchange summaries of database contents, Link-State Requests ask for specific LSAs, and Hello packets establish and maintain neighbor relationships. The acknowledgment mechanism allows OSPF routers to confirm that LSAs have been received, supporting reliable distribution of topology information throughout the appropriate OSPF area.<\/span><\/p>\nQuestion: 268. Which Junos routing table is normally used for IPv4 unicast routes?<\/b><\/p>\n\n- <\/b> inet6.0<\/span>
\n<\/span>2.<\/b> iso.0<\/span>
\n<\/span>3.<\/b> inet.0<\/span>
\n<\/span>4.<\/b> mpls.0<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 3. inet.0<\/span><\/p>\nExplanation:<\/b><\/p>\n
The Junos <\/span>inet.0<\/span> routing table is the primary routing table for IPv4 unicast routes. It contains IPv4 routes learned through protocols such as OSPF, BGP, RIP, or static configuration, depending on the device configuration. The <\/span>inet6.0<\/span> table is used for IPv6 unicast routes. Other protocol families and forwarding functions use different routing tables. Knowing the appropriate routing table is important when troubleshooting route installation because a route may exist in a different protocol-family table than the one being examined.<\/span><\/p>\nQuestion: 269. Which protocol is primarily used to provide first-hop gateway redundancy?<\/b><\/p>\n\n- <\/b> OSPF<\/span>
\n<\/span>2.<\/b> VRRP<\/span>
\n<\/span>3.<\/b> BGP<\/span>
\n<\/span>4.<\/b> IS-IS<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 2. VRRP<\/span><\/p>\nExplanation:<\/b><\/p>\n
Virtual Router Redundancy Protocol (VRRP) provides first-hop gateway redundancy by allowing multiple routers to share a virtual gateway address. Hosts can use the virtual address as their default gateway, while participating routers provide redundancy if the active router becomes unavailable. OSPF, BGP, and IS-IS are routing protocols rather than first-hop redundancy protocols. VRRP therefore addresses gateway availability at the local network edge and helps prevent a single router failure from isolating hosts from upstream networks.<\/span><\/p>\nQuestion: 270. Which OSPF device connects different OSPF areas and exchanges inter-area routing information?<\/b><\/p>\n\n- <\/b> Area Border Router<\/span>
\n<\/span>2.<\/b> Designated Router<\/span>
\n<\/span>3.<\/b> Route Reflector<\/span>
\n<\/span>4.<\/b> Autonomous System Boundary Router<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 1. Area Border Router<\/span><\/p>\nExplanation:<\/b><\/p>\n
An Area Border Router (ABR) connects one OSPF area to another and exchanges routing information between those areas. An ABR maintains link-state information for the areas to which it is connected and can generate Type 3 Summary LSAs to advertise networks between areas. A Designated Router operates on applicable multiaccess networks, while a Route Reflector is a BGP scalability mechanism. An Autonomous System Boundary Router (ASBR) connects OSPF to external routing information, such as routes redistributed from another routing protocol. These roles can sometimes exist on the same physical router but represent different functions.<\/span><\/p>\nQuestion: 271. Which IPv6 address type is automatically associated with an IPv6-enabled interface for communication on the local link?<\/b><\/p>\n\n- <\/b> Global unicast<\/span>
\n<\/span>2.<\/b> Unique local<\/span>
\n<\/span>3.<\/b> Link-local<\/span>
\n<\/span>4.<\/b> Multicast-only<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 3. Link-local<\/span><\/p>\nExplanation:<\/b><\/p>\n
IPv6 link-local addresses are associated with IPv6-enabled interfaces and are used for communication on the local link. They are normally drawn from the FE80::\/10 prefix and are not intended to be routed across IPv6 routers. Link-local addressing is essential for Neighbor Discovery and is also commonly used by IPv6 routing protocols for neighbor communication. Global unicast addresses provide broader routability, while unique local addresses are intended for internal addressing. Multicast addresses identify groups of receivers rather than representing a normal unicast interface address.<\/span><\/p>\nQuestion: 272. Which command can be used to compare pending Junos configuration changes with the active configuration?<\/b><\/p>\n\n- <\/b> show route<\/span>