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NEW QUESTION # 64
Which statement is true regarding MD5 authentication in OSPF?
Answer: B
NEW QUESTION # 65
The network you support currently has a mixture of MC-LAG and Virtual Chassis being used to provide redundant connectivity from various IDFs. A project to modernize the architecture and move to EVPN- VXLAN using ESI-LAG will be starting soon. You want to avoid IDFs losing connectivity as the core devices are migrated to EVPN-VXLAN. Which action will accomplish this task?
Answer: D
Explanation:
In an EVPN-VXLAN environment using ESI-LAG (Ethernet Segment Identifier Link Aggregation) , the Core Isolation feature is a safety mechanism designed to prevent traffic blackholing. When a leaf switch (acting as a VTEP) loses its BGP peering or its link to the IP fabric core, it assumes it is " isolated " from the rest of the network. To protect the network, the switch automatically shuts down its local member links of any multi-homed ESI-LAG to force traffic to the peer switch that still has core connectivity.
However, during a migration or in specific transitional topologies where the core might be temporarily unreachable or not yet fully established, this feature can cause the leaf switches to shut down all downstream IDF (Intermediate Distribution Frame) connections, leading to a total loss of connectivity.
* The Solution (Option C): By enabling the no-core-isolation statement under the [edit protocols evpn] hierarchy, you instruct the switch to disable this automatic shutdown behavior . This ensures that even if the BGP session or core links are not yet stable during the migration process, the ESI-LAG interfaces remain Up , allowing the IDFs to maintain connectivity to their local default gateways or other local resources.
* Why others are incorrect: Enabling EVPN-VXLAN before migration (Option A) does not address the isolation logic. Removing MC-LAG/Virtual Chassis links prematurely (Option B) would cause an immediate outage. The network-isolation-profile (Option D) is typically used for different loop prevention scenarios and does not override the specific core-isolation check that affects multi-homed ESIs.
NEW QUESTION # 66
Which IGMP version supports Source-Specific Multicast (SSM)?
Answer: B
NEW QUESTION # 67
Which two statements are true about locally generated Routing Engine traffic on a Juniper device? (Choose two.)
Answer: A,B
NEW QUESTION # 68
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: C
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 # 69
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