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| Section | Objectives |
|---|---|
| Layer 2 Switching Technologies | - Spanning Tree Protocol (STP/RSTP/MSTP) - VLANs and trunking - Ethernet switching concepts |
| Network Services | - NAT concepts in Junos - Basic multicast concepts |
| Routing Protocols | - IS-IS overview - OSPF configuration and troubleshooting - BGP fundamentals and policy control |
| Operations and Troubleshooting | - Troubleshooting routing and switching issues - Junos CLI monitoring tools |
| High Availability | - VRRP configuration and behavior - Redundancy concepts in enterprise networks |
| Routing Policy and Filtering | - Route filtering and preference control - Policy statements |
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NEW QUESTION # 196
You are troubleshooting a Layer 2 topology issue in a campus network. The switches are running RSTP. You need to verify which switch is currently acting as the root bridge and identify the root port on the local device.
Which operational command should the administrator use to view this information?
Answer: D
Explanation:
The show spanning-tree bridge command is specifically designed to surface exactly the two pieces of information required in this scenario within a single output. Its Root ID field reports the full Bridge Identifier (priority and MAC address) of whichever switch has been elected root bridge for the spanning-tree instance in question, immediately answering which switch in the campus network is currently acting as root, regardless of whether that happens to be the local device or a remote one. In the same output, the command's Root port field explicitly names the specific local interface (for example, ge-0/0/1.0) that the local switch has selected as its path toward that root bridge, directly answering the second part of the requirement without needing to cross-reference a separate command. Together, these two fields give a complete, immediate picture of both root bridge identity and local root port selection from one operational command. show spanning-tree interface instead presents a per-interface breakdown of STP role (root, designated, alternate, backup) and state across all local ports, which can indirectly reveal the root port by looking for the 'Root' role, but it does not directly report the Root ID/root bridge identity in the same structured way that show spanning-tree bridge does. show ethernet-switching table and show ethernet-switching interface pertain entirely to MAC address learning and switching-specific interface configuration respectively, and neither surfaces any spanning-tree topology or root bridge information at all. Reference topics: Junos Enterprise Switching - Spanning Tree Protocols, Verifying Root Bridge and Root Port with show spanning-tree bridge.
NEW QUESTION # 197
You have configured a GRE tunnel from your local router with tunnel source 10.0.0.1 to a remote router at destination 192.168.0.1. The tunnel is functioning until you commit set routing-options static route 0.0.0.0/0 next-hop gr-0/0/0. This configuration causes the tunnel to go down.
Which statement is correct in this scenario?
Answer: B
Explanation:
A GRE tunnel's outer, delivery-layer packets are forwarded using the router's ordinary underlay routing table, meaning the tunnel destination address (192.168.0.1 in this case) must itself be resolvable to a physical, non- tunnel next hop for the encapsulated packets to actually leave the router. Before this configuration change, the default route (or some more specific route) presumably pointed toward a real physical next hop, allowing the router to reach 192.168.0.1 and keep the tunnel operational. When the administrator commits a static default route of 0.0.0.0/0 with a next hop of gr-0/0/0, every destination lookup that previously fell back to the default route - including the lookup for the tunnel's own destination address, 192.168.0.1, since no more specific route exists for it - now recurses through the GRE interface itself. This creates a circular dependency: the router needs to route to 192.168.0.1 to keep the tunnel up, but the only route it has to reach 192.168.0.1 now points back into the tunnel that requires 192.168.0.1 to already be reachable, so the interface's next-hop resolution fails and the tunnel drops. This is an entirely valid and common GRE design pitfall rather than any platform restriction; GRE interfaces can be legitimately used as static route next hops, do not require loopback-sourced encapsulation, and do not require a /32 host route to resolve their destination, provided that route does not recursively point back through the tunnel. Reference topics: Junos Enterprise Routing - Tunneling, Route Recursion and GRE Tunnel Destination Resolution.
NEW QUESTION # 198
Which two statements are true about an EX2300 device? (Choose two.)
Answer: A,D
NEW QUESTION # 199
Referring to the output shown in the exhibit, which statement is correct?
Answer: B
Explanation:
In OSPF, the state of the neighbor relationship is determined by the exchange of OSPF packets between routers. The state "2Way" as shown in the exhibit indicates that bi-directional communication has been established between the two OSPF routers. This is the normal state for a neighbor that is not the Designated Router (DR) or Backup Designated Router (BDR) on a broadcast, non-broadcast multi-access (NBMA), or point-to-multipoint network. These neighbors are often referred to as "DRothers". Therefore, option B is correct.
NEW QUESTION # 200
What are two characteristics of IS-IS? (Choose two.)
Answer: A,D
Explanation:
IS-IS (Intermediate System to Intermediate System) was designed by ISO as a link-state Interior Gateway Protocol for routing within a single autonomous system, functioning on a hierarchical two-level model conceptually similar to OSPF's areas, which makes the first statement unambiguously correct. Within that hierarchy, Level 1 routers maintain detailed topology information only for their own local area and use a default route toward the nearest Level 2 or Level 1/Level 2 router to reach destinations outside the area; they explicitly do not carry inter-area topology information and therefore cannot route traffic between areas on their own. Routers that participate in both levels simultaneously -- Level 1/Level 2 (L1/L2) routers -- sit at the area boundary, maintaining a Level 1 database for their local area and a Level 2 database for the backbone, and it is specifically these dual- level routers that stitch inter-area traffic together, forwarding packets from the local area into the Level 2 backbone and vice versa, which confirms the second correct statement. Regarding route preference, Junos assigns distinct default preference (administrative distance) values of 15 for IS-IS Level 1 routes and 18 for IS-IS Level 2 routes -- neither of which is 20 -- so the preference-value statement is factually incorrect and included as a distractor testing precise knowledge of Junos default protocol preferences.
NEW QUESTION # 201
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