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| Section | Objectives |
|---|---|
| Topic 1: Layer 2 Switching Technologies | - Ethernet switching concepts - VLANs and trunking - Spanning Tree Protocol (STP/RSTP/MSTP) |
| Topic 2: Routing Policy and Filtering | - Policy statements - Route filtering and preference control |
| Topic 3: Network Services | - NAT concepts in Junos - Basic multicast concepts |
| Topic 4: Operations and Troubleshooting | - Troubleshooting routing and switching issues - Junos CLI monitoring tools |
| Topic 5: High Availability | - VRRP configuration and behavior - Redundancy concepts in enterprise networks |
| Topic 6: Routing Protocols | - BGP fundamentals and policy control - IS-IS overview - OSPF configuration and troubleshooting |
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NEW QUESTION # 154
You are asked to change the setting for the LSAs age out back to the default value. In this scenario, which time interval will accomplish this task?
Answer: D
NEW QUESTION # 155
Based on the traceoptions output shown in the exhibit, what is the problem with the adjacency?
Answer: B
NEW QUESTION # 156
Which IS-IS TLV should be used to advertise information about the router's neighbors and link metrics?
Answer: A
Explanation:
TLV 22, the Extended IS Reachability TLV defined in RFC 5305, is the modern and Junos- preferred mechanism for advertising a router's adjacent neighbors together with the metric associated with each link. It carries the seven-octet system ID and pseudonode number of each neighbor along with a 24-bit wide metric field, and supports an extensible set of sub-TLVs used for traffic-engineering data such as interface and neighbor IP addresses, bandwidth, and administrative groups. The original IS Reachability TLV, TLV 2, defined in the base ISO 10589 standard, carries similar neighbor and metric information but is constrained to a 6-bit narrow metric with a maximum value of 63, which is inadequate for expressing meaningful cost differentiation in modern, high-capacity enterprise and service-provider topologies; consequently, Junos deployments are commonly configured for wide-metrics-only, favoring TLV 22 over the legacy TLV 2 whenever traffic-engineering-capable or simply more granular metric representation is desired. TLV 132, the IP Interface Address TLV, only advertises the IPv4 addresses configured on the originating router's interfaces and carries no neighbor- adjacency or metric information.
TLV 129, the Protocols Supported TLV, merely lists which network- layer protocols (such as IPv4 or IPv6) the originating router is capable of routing, and likewise has nothing to do with neighbor reachability or link cost.
NEW QUESTION # 157
You are deploying an EX Series switch with a Wi-Fi access point. The access point needs all untagged traffic to use a specific VLAN. In this scenario, which feature should you enable on the switch port?
Answer: B
NEW QUESTION # 158
Refer to Exhibit. Which two statements about the output shown in the exhibit are correct?
(Choose two.)
Answer: B,C
Explanation:
The L column in this output identifies which IS-IS levels are active on each interface, using the standard bitmask where 1 represents Level 1 only and 3 represents both Level 1 and Level 2 combined. Interface ge-0/0/2.0 shows an L value of 1 and its Level 2 DR field explicitly reads Disabled, meaning Level 2 has not been enabled on that circuit at all; consequently no Level 2 adjacency can ever form there, regardless of what the neighboring router advertises, which confirms that statement as correct. The lo0.0 loopback interface shows Passive under both the Level 1 DR and Level 2 DR columns. A passive IS-IS interface is deliberately excluded from adjacency formation -- no IIH PDUs are sent or expected on it -- but its associated prefix is still injected into the router's own LSP and flooded throughout the area, which is precisely why loopbacks are configured as passive: to guarantee the router ID/loopback prefix is reachable network-wide without wasting adjacency overhead on an interface with no real neighbor. This confirms that R3 advertises its loopback address, while ruling out the claim that the loopback is used to form an adjacency. Regarding designated routers, all circuits shown here report 'Point to Point' rather than an actual DR system ID, because DR election in IS-IS is a construct exclusive to broadcast (LAN) circuits; point-to-point circuits never elect a DR, so the first statement is false.
NEW QUESTION # 159
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