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| Section | Objectives |
|---|---|
| High Availability | - VRRP, NSR, NSB and BFD - Link Aggregation Groups and RTG - Virtual chassis and graceful restart |
| OSPF | - Router ID, adjacencies and neighbors - Areas and LSA types - Link-state database and packet types |
| Spanning Tree | - Convergence and reconvergence - Bridge Protocol Data Units (BPDUs) - STP and RSTP concepts, roles and states |
| Layer 2 Switching and VLANs | - Ports and VLAN tagging - Native VLANs and voice VLANs - Inter-VLAN routing - Frame processing - Bridging components |
| Protocol-Independent Routing | - Martian addresses and RIB groups - Load balancing and filter-based forwarding - Static, aggregate, generated routes |
| BGP | - BGP basic operations and message types - Attributes and path selection - EBGP and IBGP peer interactions |
| Tunnels | - IP tunneling concepts - GRE and IP-IP configuration and troubleshooting |
| IS-IS | - Link-state database and PDUs - Levels, areas and metrics - Adjacencies and troubleshooting |
| Layer 2 Security | - Layer 2 firewall filters - BPDU, loop and root protection - MACsec and storm control - Port security (MAC limiting, DHCP snooping, DAI, IP source guard) |
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NEW QUESTION # 37
Which three actions are required for filter-based forwarding? (Choose three.)
Answer: B,D,E
NEW QUESTION # 38
Which IS-IS PDU should be used by a router to list all LSPs that it believes should exist in the link-state database?
Answer: C
Explanation:
The Complete Sequence Number PDU (CSNP) is the IS-IS mechanism used to summarize the entire contents of a router's link-state database, listing the LSP ID, sequence number, checksum, and remaining lifetime for every LSP the sending router currently believes should exist in the database for that level. On broadcast (LAN) circuits, the elected Designated Intermediate System periodically transmits CSNPs to all routers on the segment as a database-synchronization mechanism; any receiving router compares the summarized list against its own local database, and any discrepancy -- an LSP it is missing entirely, or one for which it holds an older sequence number -- triggers a targeted request for the specific, updated LSP content. On point-to-point circuits, a single CSNP is exchanged once when the adjacency first comes up, serving the identical synchronization purpose without needing periodic repetition. The Partial Sequence Number PDU (PSNP), by contrast, is used to acknowledge receipt of specific LSPs or to explicitly request specific LSPs identified as missing or outdated after a CSNP comparison, making it a partial, targeted PDU rather than a complete database listing. The LSP itself is the PDU that actually carries the detailed topology and reachability information being advertised, rather than a database summary. The IS-IS Hello PDU (IIH) is used purely for neighbor discovery and adjacency maintenance and carries no link-state database summary information whatsoever.
NEW QUESTION # 39
You enable the point-to-point parameter on your OSPF interface configuration.
In this scenario, what are two benefits of this action? (Choose two.)
Answer: A,B
Explanation:
Configuring interface-type p2p under an OSPF interface tells Junos to treat that interface as a point-to-point network type regardless of the underlying physical medium, which removes the interface from the standard broadcast-network state machine entirely. On a true broadcast network, two routers must first complete a Designated Router and Backup Designated Router election, wait through the associated timers, and only then proceed through 2-Way, ExStart, Exchange, and Loading before reaching Full - a multi-step process. A point-to-point interface skips DR/BDR election altogether and proceeds directly from 2-Way into ExStart, so adjacencies form measurably faster, which is the first correct benefit. Because there is no DR on a point-to- point interface, Junos also does not generate a Type 2 Network LSA to describe the segment; the connected subnet is instead advertised as a simple stub-network entry inside the Router LSA itself, eliminating an entire LSA type from the area's link-state database and reducing its overall size, which is the second correct benefit.
Point-to-point configuration is entirely incompatible with DR election, so a router configured this way cannot
'win' a DR election - there is no DR to win. Advertisement of the connected network happens on any operational OSPF interface irrespective of network type, so that option describes normal OSPF behavior rather than a benefit specific to the point-to-point setting. Reference topics: Junos Enterprise Routing - OSPF Network Types, Configuring OSPF Interface Type.
NEW QUESTION # 40
You have enabled MACsec on two directly connected Ethernet devices but MACsec is not working. Which two actions will solve this problem? (Choose two.)
Answer: A,C
Explanation:
MACsec (IEEE 802.1AE) secures a point-to-point Ethernet link independently of how the logical unit above it is configured for VLAN tagging, so neither trunk mode nor access mode has any bearing on whether the MACsec Key Agreement (MKA) protocol can establish a secure channel.
What does determine success is the pre-shared key material: when static CAK security mode is used, the Connectivity Association Key (CAK) and the Connectivity Association Key Name (CKN) must be configured identically on both ends of the link. If they do not match, MKA never completes the exchange, no secure channel is created, and all traffic on that interface is dropped rather than merely left unencrypted. Equally important, and frequently overlooked, is that MACsec adds up to 32 bytes of overhead per frame for the security tag (SecTAG) and integrity check value (ICV); Juniper's official guidance is to ensure the difference between the interface's physical MTU and the protocol MTU is large enough to absorb this overhead, or frames will be silently discarded once encryption is active, producing symptoms that look identical to a failed session.
Both the CAK/CKN and MTU checks are documented first-line troubleshooting steps for MACsec on EX Series switches.
NEW QUESTION # 41
How does BGP prevent routing loops between internal peers?
Answer: C
Explanation:
BGP employs two distinct loop-prevention mechanisms depending on whether peers are external or internal to the same autonomous system. Between external peers (EBGP), loop prevention relies on the AS path attribute: every time a route crosses an AS boundary, the local AS number is prepended to the path, and a router rejects any incoming route whose AS path already contains its own AS number, since that would indicate the route has looped back around.
Between internal peers (IBGP) within the same AS, however, the AS path attribute never changes, because IBGP does not add AS numbers as routes are readvertised internally -- meaning AS path alone cannot detect an internal loop. Instead, IBGP enforces a strict split- horizon-style rule: a router that learns a route via IBGP must never readvertise that route to another IBGP peer. This rule guarantees that every IBGP speaker within the AS must be directly peered with every other IBGP speaker (a logical full mesh) in order for all routers to receive all routes, since no IBGP router will relay IBGP-learned routes onward on another router's behalf.
This full-mesh requirement is precisely why techniques such as route reflection and confederations were later developed -- they preserve the same loop-prevention guarantee while relaxing the physical full-mesh peering burden. VRRP and BFD serve entirely unrelated purposes (gateway redundancy and fast failure detection, respectively) and play no role in BGP loop prevention.
NEW QUESTION # 42
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