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NEW QUESTION # 82
Your Layer 2 network uses 802.1X to authenticate user devices connecting to the network. You are asked to include a new Layer 2 interface connection from the conference room in your network. You must ensure that only a single device is allowed to authenticate on this port at one time to avoid users from being able to plug in a rogue switch to this port.
In this scenario, which 802.1X method would you use for the new interface?
Answer: C
NEW QUESTION # 83
Click the Exhibit button.
You are troubleshooting suboptimal routing in an enterprise OSPFv2 deployment:
-- R1 is an ABR between Area 0 and Area 1.
-- R2 is an ABR between Area 0 and Area 2.
-- R3 in Area 1 advertises a network that should be reachable by routers in Area 2.
-- The ABRs are connected in the backbone (Area 0).
On router R2, the show ospf database does not display router LSAs or network LSAs from Area 1, but an interarea route to R3's network exists in the routing table. R2 does not have Type-1 or Type-2 LSAs from Area 1 in its OSPF database.
Referring to the exhibit, which statement is correct?
Answer: C
Explanation:
The behavior described is the fundamental operational principle of OSPF ' s hierarchical area structure.
* LSA Flooding Scope: In OSPFv2, Type-1 (Router) and Type-2 (Network) Link-State Advertisements (LSAs) are restricted to a local area flooding scope . They contain detailed topology information (such as which routers are connected to which links) that is only relevant for calculating the Shortest Path First (SPF) tree within that specific area.
* ABR Functionality: Area Border Routers (ABRs), such as R1 in this scenario, act as the gateway between areas. The ABR does not forward Type-1 or Type-2 LSAs from one area to another. Instead, it extracts the prefix information (the network address and mask) from those LSAs and generates a Type-
3 (Summary) LSA .
* Interarea Reachability: This Type-3 LSA is then flooded into the backbone (Area 0) and subsequently into other non-backbone areas, such as Area 2. This explains why R2 sees an " interarea route " to R3's network in its routing table and has the corresponding Type-3 LSA in its database, but cannot see the original Type-1 or Type-2 LSAs from Area 1.
* Why other options are incorrect: Option A is incorrect because this is standard protocol behavior, not the result of a manual filter. Option B is incorrect as there is no such " disable " feature; the protocol design inherently prevents these LSAs from crossing boundaries. Option C is incorrect because OSPFv3 still uses Type-1 and Type-2 LSAs (renamed but functionally similar for topology), and the prompt specifically identifies the deployment as OSPFv2 .
NEW QUESTION # 84
Which two statements are correct about OSPFv2 and OSPFv3? (Choose two.)
Answer: A,C
Explanation:
OSPFv2 (IPv4) and OSPFv3 (IPv6) share many fundamental concepts, such as the SPF algorithm and the use of areas, but they have distinct differences in how they handle prefix information and LSA headers in Junos OS.
Backbone Requirement (Option C): Both OSPFv2 and OSPFv3 utilize a hierarchical structure. In both versions, all areas must connect to a central Area 0 (the backbone) to allow for inter-area routing. If an area is not physically connected to Area 0, a virtual link must be established.
Flooding Scope (Option D): One of the significant architectural changes in OSPFv3 is the inclusion of the flooding scope directly into the LSA header. In OSPFv3, the LS Type field is expanded to 16 bits, where the top three bits define the flooding scope (e.g., Link-local, Area, or AS scope). This allows routers to understand how far an LSA should be propagated without needing to understand the specific LSA type itself.
LSA Prefix Information (Option A): This statement is misleading. In OSPFv2, Router and Network LSAs (Type 1 and 2) carry both topology and prefix information. However, a key design goal of OSPFv3 was to separate topology from prefix information. In OSPFv3, Type 1 and 2 LSAs only describe the topology, while prefixes are carried in new LSA types: Intra-Area-Prefix-LSAs (Type 9) and Link-LSAs (Type 8).
Processing (Option B): OSPFv2 is processed " per-subnet " because it forms adjacencies based on IPv4 subnets. OSPFv3 is processed " per-link " , meaning it forms adjacencies between interfaces on the same physical link regardless of whether they share a common IPv6 prefix.
NEW QUESTION # 85
How does BGP's next-hop resolution feature work?
Answer: A
NEW QUESTION # 86
You are asked to establish authentication for users connecting to the corporate network. You must ensure that only corporate devices that are identified by MAC addresses are allowed to authenticate and connect Authentication must be handled by a centralized database.
Which authentication method would you implement in this scenario?
Answer: A
Explanation:
In this scenario, the requirement is to authenticate devices based on their MAC addresses using a centralized database.
MAC RADIUS (Option A): This is the standard Juniper method for authenticating " headless " or non-802.1X capable devices based on their hardware (MAC) address. The switch acts as a proxy, sending the device ' s MAC address as the username and password to a centralized RADIUS server (the centralized database). If the MAC address is found in the server ' s database, the device is granted access to the network. This perfectly matches the user ' s requirement for MAC-based authentication and a centralized database.
Captive Portal (Option B): This is a web-based authentication method requiring user interaction (login via a browser), which is not based on MAC address identification for the initial authentication phase.
Supplicant Modes (Options C & D): These define how multiple devices are handled on an 802.1X-enabled port, but they are not authentication methods themselves; they rely on 802.1X (EAP-based) or MAC-RADIUS being already configured.
NEW QUESTION # 87
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