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| Section | Objectives |
|---|---|
| Tunnels | - IP tunneling concepts - GRE and IP-IP configuration and troubleshooting |
| BGP | - BGP basic operations and message types - Attributes and path selection - EBGP and IBGP peer interactions |
| Protocol-Independent Routing | - Load balancing and filter-based forwarding - Martian addresses and RIB groups - Static, aggregate, generated routes |
| IS-IS | - Levels, areas and metrics - Link-state database and PDUs - Adjacencies and troubleshooting |
| Layer 2 Switching and VLANs | - Ports and VLAN tagging - Inter-VLAN routing - Frame processing - Bridging components - Native VLANs and voice VLANs |
| High Availability | - Link Aggregation Groups and RTG - Virtual chassis and graceful restart - VRRP, NSR, NSB and BFD |
| Layer 2 Security | - Layer 2 firewall filters - MACsec and storm control - Port security (MAC limiting, DHCP snooping, DAI, IP source guard) - BPDU, loop and root protection |
| Spanning Tree | - Convergence and reconvergence - Bridge Protocol Data Units (BPDUs) - STP and RSTP concepts, roles and states |
| OSPF | - Link-state database and packet types - Areas and LSA types - Router ID, adjacencies and neighbors |
>> Standard JN0-352 Answers <<
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NEW QUESTION # 97
Which two multicast IP addresses are used for link-state update packets? (Choose two.)
Answer: B,D
NEW QUESTION # 98
Which statement describes how a generated route determines its next hop?
Answer: A
Explanation:
A generate route is a specialized type of Junos summary route that, unlike an aggregate route, is permitted to inherit and use an actual forwarding next hop rather than being restricted to reject or discard. When multiple contributing routes exist beneath the summarized prefix, Junos selects one of them as the primary contributor using a deterministic process: it first evaluates route preference (choosing the contributor with the lowest, most preferred value), then breaks any remaining tie by preferring the contributing route with the numerically lowest metric, and continues through further tie-breaking criteria if necessary until a single primary contributor is identified. The generate route then adopts the next hop of that specific primary contributor as its own forwarding next hop, meaning traffic matching the generate route but not matching any individual contributing route is forwarded toward whichever real next hop the primary (best) contributing route currently uses. This behavior is fundamentally different from an aggregate route, which never adopts a forwarding next hop at all and instead installs with a reject (or optionally discard) next hop by default, deliberately preventing traffic from being forwarded toward a next hop that might not actually lead to the intended more-specific destination. There is no mechanism by which the next hop is chosen arbitrarily from the 'first' or 'least- specific' contributor, and while a next hop can be manually overridden under the generate route's own configuration, that is not the default resolution behavior being described here. Reference topics: Junos Enterprise Routing - Protocol Independent Routing, Generate Routes and Primary Contributor Selection.
NEW QUESTION # 99
What is the default keepalive time for BGP?
Answer: D
Explanation:
The default hold-time is 90 seconds, meaning that the default frequency for keepalive messages is 30 seconds.
https://www.juniper.net/documentation/us/en/software/junos/bgp/topics/ref/statement/precision-timers-edit-protocols-bgp.html#:~:text=BGP%20on%20the%20local%20routing,keepalive%20messages%20is%2030
%20seconds
NEW QUESTION # 100
You want to prevent rogue BPDUs from lab devices reaching the internal through the Lab_Switch device.
Referring to the exhibit, what should be done to accomplish this task?
Answer: D
NEW QUESTION # 101
Which two statements describe the purpose of a BGP notification message? (Choose two.)
Answer: B,C
Explanation:
A BGP NOTIFICATION message is one of the four core message types defined in RFC 4271, alongside OPEN, UPDATE, and KEEPALIVE, and it serves a very specific and narrow purpose within the protocol:
whenever a BGP speaker detects an unrecoverable, fatal condition in the session - such as a malformed OPEN message, an unsupported capability, a hold-timer expiration, a finite-state-machine error, or an administratively initiated reset - it transmits a NOTIFICATION message to its peer immediately before closing the underlying TCP connection and tearing down the session entirely. This confirms that a NOTIFICATION always signals the termination of the session upon a fatal error, never a routine, in-session update. Structurally, every NOTIFICATION message carries a defined error code and error subcode field, which together precisely classify the category and specific nature of the fault that triggered the termination (for example, 'Cease' with a subcode indicating administrative shutdown, or 'Update Message Error' with a subcode indicating a malformed attribute), giving the receiving peer's administrator concrete diagnostic information about exactly why the session was torn down. Updating route attributes while keeping a session alive is the role of the UPDATE message, not NOTIFICATION, and refreshing a neighbor's table without resetting the session describes the optional Route Refresh capability (a separate, distinct BGP mechanism), neither of which describes NOTIFICATION's function. Reference topics: Junos Enterprise Routing - BGP, BGP Message Types and the NOTIFICATION Message.
NEW QUESTION # 102
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