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| Section | Objectives |
|---|---|
| High Availability | - Redundancy concepts in enterprise networks - VRRP configuration and behavior |
| Routing Protocols | - BGP fundamentals and policy control - IS-IS overview - OSPF configuration and troubleshooting |
| Operations and Troubleshooting | - Junos CLI monitoring tools - Troubleshooting routing and switching issues |
| Routing Policy and Filtering | - Policy statements - Route filtering and preference control |
| Network Services | - NAT concepts in Junos - Basic multicast concepts |
| Layer 2 Switching Technologies | - Spanning Tree Protocol (STP/RSTP/MSTP) - Ethernet switching concepts - VLANs and trunking |
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NEW QUESTION # 118
You manage the Layer 2 network shown in the exhibit. You experience a failure on the ge-0/0/0 link between Switch-1 and Switch-2.
Which statement is correct about the expected behavior?
Answer: A
NEW QUESTION # 119
On Juniper devices, which statement correctly describes a basic characteristic of a GRE tunnel?
Answer: B
Explanation:
GRE is fundamentally a stateless encapsulation protocol: the encapsulating router simply wraps the passenger packet in a GRE header and an outer delivery IP header and forwards it based on ordinary IP routing table lookups toward the configured tunnel destination address. For that forwarding to succeed, the underlying (global or routing-instance) routing table on each endpoint must contain a valid, reachable route to the far-end tunnel address; without such a route, the tunnel interface will not come up or will be unable to deliver traffic, since GRE relies entirely on the existing IP infrastructure rather than any tunnel-specific signaling to establish reachability.
Because GRE has no built-in state machine or session negotiation, it does not natively track whether the remote endpoint is alive -- that requires an optional add-on such as GRE keepalives or BFD, neither of which is enabled by default; an operator must explicitly configure them if failure detection is required. GRE is also protocol-agnostic rather than IPv4-only: it can encapsulate IPv4, IPv6, MPLS, and other network- layer protocols as the passenger, which is one of its defining advantages over IP-in-IP tunneling. Finally, because GRE keeps no per-session state about the peer, it cannot detect or report tunnel failures on its own, reinforcing why route reachability is the one true prerequisite for tunnel operation.
NEW QUESTION # 120
You are deploying a trunk port with multiple VLANs. In this scenario, which statement is true about the native VLAN?
Answer: B
NEW QUESTION # 121
You are configuring an IS-IS IGP network and do not see the IS-IS adjacencies established. In this scenario, what are two reasons for this problem? (Choose two.)
Answer: A,B
Explanation:
Option A suggests that the MTU is not at least 1492 bytes. This is correct because IS-IS requires a minimum MTU of 1492 bytes to establish adjacencies. If the MTU is less than this, IS-IS adjacencies will not be established.
Option D suggests that the lo0 interface is not included as an IS-IS interface. This is also correct because the loopback interface (lo0) is typically used as the router ID in IS-IS. If the loopback interface is not included in IS-IS, it could prevent IS-IS adjacencies from being established.
NEW QUESTION # 122 
Click the Exhibit button.
You want the RSTP primary root path from switch C to traverse switch B.
Referring to the exhibit, which solution will accomplish this task?
Answer: C
Explanation:
Switch A is already fixed as the root bridge in this topology (priority 0), so the outcome being engineered here is not about root bridge election at all, but about which of Switch C's two available paths toward that already- established root - the direct C-to-A link, or the indirect C-to-B-to-A path - RSTP selects as the lower-cost, primary path. RSTP's path-cost calculation for any non-root switch sums the port costs of every link along a candidate path to the root and always selects whichever candidate path has the lowest total accumulated cost as that switch's active root path, placing the corresponding local port into the forwarding root port role while any higher-cost alternative path is placed into a non-forwarding (alternate) role. To force Switch C to prefer routing through Switch B rather than connecting to Switch A directly, the administrator must make the direct C-to-A link's cost higher than the combined cost of the C-to-B link plus the B-to-A link added together, so that the indirect, two-hop path through Switch B mathematically totals to a lower cumulative cost than the single direct hop, causing RSTP's cost comparison to favor the indirect path as primary. Setting Switch B's priority (to either 1 or 0) is irrelevant here, since Switch B is not a root bridge candidate in this scenario and priority manipulation would only affect a root bridge election, not path cost preference between a fixed root and a downstream switch. Lowering the direct link's cost, the inverse of the correct answer, would instead reinforce the direct path rather than override it. Reference topics: Junos Enterprise Switching - Spanning Tree Protocols, RSTP Path Cost and Root Port Selection.
NEW QUESTION # 123
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