Juniper JN0-364\u00a0 Exam Dumps<\/b><\/a> and Practice Test Dumps<\/b><\/p>\nQuestion: 121. Which Junos command displays a summary of BGP peer sessions and their states?<\/b><\/p>\n\n- <\/b> show bgp summary<\/span>
\n<\/span>2.<\/b> show route protocol bgp<\/span>
\n<\/span>3.<\/b> show ospf neighbor<\/span>
\n<\/span>4.<\/b> show interfaces terse<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 1. <\/span>show bgp summary<\/span><\/p>\nExplanation:<\/b><\/p>\n
The <\/span>show bgp summary<\/span> command provides a concise overview of BGP peer sessions. Its output includes information such as local and peer autonomous system numbers, peer addresses, session state, and the number of prefixes received or advertised. It is commonly used as an initial troubleshooting command when verifying BGP connectivity and session establishment. The <\/span>show route protocol bgp<\/span> command instead focuses on BGP-learned routes installed in the routing table rather than providing a summary of peer-session status.<\/span><\/p>\nQuestion: 122. Which OSPF packet type is primarily used to discover and maintain OSPF neighbors?<\/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 Acknowledgment<\/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 existing neighbor relationships. Hello packets contain information such as the router ID, area, hello and dead intervals, and other parameters that must be compatible for an adjacency to form. Regular Hello exchanges also allow routers to determine whether neighbors remain reachable. Other OSPF packet types serve different purposes: Database Description packets summarize databases, Link-State Updates carry LSAs, and Link-State Acknowledgments confirm receipt of LSAs.<\/span><\/p>\nQuestion: 123. Which BGP attribute is generally preferred when selecting an outbound path within an autonomous system?<\/b><\/p>\n\n- <\/b> MED with the highest value<\/span>
\n<\/span>2.<\/b> Local Preference with the highest value<\/span>
\n<\/span>3.<\/b> AS_PATH with the greatest length<\/span>
\n<\/span>4.<\/b> Origin with the least-preferred value<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 2. Local Preference with the highest value<\/span><\/p>\nExplanation:<\/b><\/p>\n
Local Preference is an important BGP path-selection attribute used within an autonomous system to influence outbound traffic. When comparing eligible BGP paths, a higher Local Preference is generally preferred. Because the attribute is propagated through iBGP, administrators can use it to influence exit-point selection throughout the autonomous system. MED has a different purpose and is generally used to communicate a preference for how traffic should enter an autonomous system. AS_PATH length and origin are also considered during BGP path selection but do not replace Local Preference’s role.<\/span><\/p>\nQuestion: 124. What is the primary purpose of the OSPF SPF algorithm?<\/b><\/p>\n\n- <\/b> To calculate shortest paths through the OSPF topology<\/span>
\n<\/span>2.<\/b> To authenticate BGP peers<\/span>
\n<\/span>3.<\/b> To assign IP addresses to interfaces<\/span>
\n<\/span>4.<\/b> To negotiate Ethernet link aggregation<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 1. To calculate shortest paths through the OSPF topology<\/span><\/p>\nExplanation:<\/b><\/p>\n
OSPF uses the Shortest Path First algorithm, based on Dijkstra’s algorithm, to calculate the shortest paths through the topology represented by its link-state database. Each router builds a view of the network topology from received LSAs and independently calculates its shortest-path tree. The resulting information is used to install appropriate routes in the routing table. SPF is therefore a core component of OSPF route calculation and is unrelated to address assignment, BGP authentication, or Ethernet aggregation.<\/span><\/p>\nQuestion: 125. Which Junos command displays the currently active configuration?<\/b><\/p>\n\n- <\/b> show | compare<\/span>
\n<\/span>2.<\/b> show configuration<\/span>
\n<\/span>3.<\/b> show route<\/span>
\n<\/span>4.<\/b> show system uptime<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 2. <\/span>show configuration<\/span><\/p>\nExplanation:<\/b><\/p>\n
The <\/span>show configuration<\/span> command displays the current committed configuration in Junos configuration mode. It allows an administrator to inspect configured interfaces, routing protocols, policies, system settings, and other configuration hierarchy elements. By contrast, <\/span>show | compare<\/span> is used to compare the candidate configuration with the currently committed configuration. <\/span>show route<\/span> displays routing information, while <\/span>show system uptime<\/span> provides system operational information.<\/span><\/p>\nQuestion: 126. Which protocol is commonly used by RIP to exchange routing updates over IPv4?<\/b><\/p>\n\n- <\/b> TCP port 179<\/span>
\n<\/span>2.<\/b> UDP port 520<\/span>
\n<\/span>3.<\/b> UDP port 161<\/span>
\n<\/span>4.<\/b> TCP port 22<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 2. UDP port 520<\/span><\/p>\nExplanation:<\/b><\/p>\n
RIPv1 and RIPv2 use UDP port 520 to exchange routing updates for IPv4. RIP is a distance-vector routing protocol that uses hop count as its primary metric and has a maximum usable hop count of 15. TCP port 179 is used by BGP, UDP port 161 is associated with SNMP, and TCP port 22 is commonly used for SSH. Knowing the transport details of routing protocols can be useful when troubleshooting firewall filters and connectivity problems.<\/span><\/p>\nQuestion: 127. What is the purpose of an OSPF Area Border Router (ABR)?<\/b><\/p>\n\n- <\/b> To connect different OSPF areas and exchange inter-area routing information<\/span>
\n<\/span>2.<\/b> To replace all OSPF routers with BGP routers<\/span>
\n<\/span>3.<\/b> To provide DHCP addresses to hosts in every area<\/span>
\n<\/span>4.<\/b> To create Ethernet switching loops<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 1. To connect different OSPF areas and exchange inter-area routing information<\/span><\/p>\nExplanation:<\/b><\/p>\n
An OSPF Area Border Router has interfaces in multiple OSPF areas and participates in exchanging routing information between those areas. ABRs help maintain OSPF’s hierarchical design and can originate Type 3 Summary LSAs to advertise networks from one area into another. Area 0 is the backbone area and normally provides the central connection for inter-area routing. An ABR is a routing function, not a DHCP service or Ethernet switching mechanism.<\/span><\/p>\nQuestion: 128. Which IPv6 mechanism performs address resolution and neighbor discovery instead of traditional IPv4 ARP?<\/b><\/p>\n\n- <\/b> ICMPv6 Neighbor Discovery<\/span>
\n<\/span>2.<\/b> DHCP relay only<\/span>
\n<\/span>3.<\/b> BGP<\/span>
\n<\/span>4.<\/b> OSPF Type 5 LSAs<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 1. ICMPv6 Neighbor Discovery<\/span><\/p>\nExplanation:<\/b><\/p>\n
IPv6 uses ICMPv6 Neighbor Discovery to perform functions that include discovering neighboring devices, resolving link-layer addresses, detecting duplicate addresses, and learning router information. Neighbor Solicitation and Neighbor Advertisement messages are central to these operations. Unlike IPv4, IPv6 does not use ARP for address resolution. Neighbor Discovery relies heavily on IPv6 multicast rather than broadcast. This mechanism is fundamental to normal IPv6 operation on an Ethernet or other supported local link.<\/span><\/p>\nQuestion: 129. What is the purpose of the BGP NEXT_HOP attribute?<\/b><\/p>\n\n- <\/b> To identify the IP address used as the next forwarding destination toward a BGP route<\/span>
\n<\/span>2.<\/b> To specify the BGP authentication password<\/span>
\n<\/span>3.<\/b> To identify the originating OSPF area<\/span>
\n<\/span>4.<\/b> To define the maximum number of BGP peers<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 1. To identify the IP address used as the next forwarding destination toward a BGP route<\/span><\/p>\nExplanation:<\/b><\/p>\n
The BGP NEXT_HOP attribute identifies the IP address that should be used as the next hop when forwarding traffic toward a BGP-advertised destination. A receiving router must have a valid route to the next-hop address for the BGP route to be usable. In eBGP and iBGP scenarios, next-hop processing can differ depending on the topology and configuration. Troubleshooting an unreachable BGP next hop is therefore an important part of diagnosing routes that are received but not installed as active routes.<\/span><\/p>\nQuestion: 130. Which Junos command is used to compare the candidate configuration with the committed configuration?<\/b><\/p>\n\n- <\/b> show route protocol bgp<\/span>
\n<\/span>2.<\/b> show | compare<\/span>
\n<\/span>3.<\/b> show interfaces extensive<\/span>
\n<\/span>4.<\/b> show system alarms<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 2. <\/span>show | compare<\/span><\/p>\nExplanation:<\/b><\/p>\n
The <\/span>show | compare<\/span> command is used in Junos configuration mode to display differences between the candidate configuration and the currently committed configuration. It is particularly useful before committing changes because it lets an administrator review what has been added, removed, or modified. This can help prevent unintended configuration changes from being committed. Operational commands such as <\/span>show route<\/span> or <\/span>show system alarms<\/span> provide runtime information and do not perform this configuration comparison.<\/span><\/p>\nQuestion: 131. Which OSPF LSA type describes a multi-access network segment and is originated by the DR?<\/b><\/p>\n\n- <\/b> Type 5<\/span>
\n<\/span>2.<\/b> Type 3<\/span>
\n<\/span>3.<\/b> Type 1<\/span>
\n<\/span>4.<\/b> Type 2<\/span><\/li>\n<\/ol>\nCorrect Answer:<\/b> 4. Type 2<\/span><\/p>\nExplanation:<\/b><\/p>\n
An OSPF Type 2 Network LSA is originated by the Designated Router on a multi-access network such as Ethernet. It describes the routers attached to that network segment and helps represent the multi-access portion of the topology in the link-state database. Type 1 Router LSAs are originated by individual routers, Type 3 Summary LSAs are generated by ABRs for inter-area information, and Type 5 LSAs describe external routes. The Type 2 LSA therefore has a specific relationship with the DR.<\/span><\/p>\nQuestion: 132. Which BGP community attribute prevents a route from being advertised to external BGP peers?<\/b><\/p>\n\n- <\/b> no-export<\/span>
\n<\/span>2.<\/b> no-advertise<\/span>