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| Section | Objectives |
|---|---|
| Tunnels | - IP tunneling concepts - GRE and IP-IP configuration and troubleshooting |
| IS-IS | - Adjacencies and troubleshooting - Link-state database and PDUs - Levels, areas and metrics |
| Layer 2 Switching and VLANs | - Inter-VLAN routing - Native VLANs and voice VLANs - Bridging components - Frame processing - Ports and VLAN tagging |
| OSPF | - Link-state database and packet types - Areas and LSA types - Router ID, adjacencies and neighbors |
| High Availability | - Virtual chassis and graceful restart - Link Aggregation Groups and RTG - VRRP, NSR, NSB and BFD |
| BGP | - EBGP and IBGP peer interactions - Attributes and path selection - BGP basic operations and message types |
| Layer 2 Security | - Port security (MAC limiting, DHCP snooping, DAI, IP source guard) - BPDU, loop and root protection - MACsec and storm control - Layer 2 firewall filters |
| Protocol-Independent Routing | - Martian addresses and RIB groups - Static, aggregate, generated routes - Load balancing and filter-based forwarding |
| Spanning Tree | - Bridge Protocol Data Units (BPDUs) - STP and RSTP concepts, roles and states - Convergence and reconvergence |
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NEW QUESTION # 21
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: A
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. Reference topics: Junos Enterprise Routing - IS-IS, CSNP and Link-State Database Synchronization.
NEW QUESTION # 22
You have configured an aggregate route for prefix 10.20.0.0/22 with three contributing routes:
10.20.0.0/24, 10.20.1.0/24, and 10.20.2.0/24. A packet arrives destined to 10.20.3.100. In this scenario, which action does the router take?
Answer: A
Explanation:
The 10.20.0.0/22 aggregate covers the four /24 blocks 10.20.0.0/24 through 10.20.3.0/24, but only the first three of those (10.20.0.0/24, 10.20.1.0/24, and 10.20.2.0/24) are configured and present as active contributing routes; 10.20.3.0/24, the block containing the destination address
10.20.3.100, has no corresponding contributing route in this configuration. Because no more- specific route exists for 10.20.3.100, the longest-match lookup falls through the missing /24 and matches only the broader /22 aggregate itself. By default, when Junos installs an aggregate route, it assigns that route a reject next hop rather than any usable forwarding next hop; this is a deliberate design choice so that traffic destined for gaps within an advertised summary block -- gaps where no real, more- specific path actually exists -- is not blindly forwarded toward whatever next hop happens to belong to one of the unrelated contributing routes. A reject next hop causes the router to drop the packet and generate and return an ICMP destination-unreachable message to the originating source, explicitly informing it that no path exists, which is functionally and behaviorally distinct from a silent discard next hop that would drop the packet without any such notification. Aggregate routes never adopt or forward through any single contributing route's next hop, which rules out the two forwarding-based answer choices entirely.
NEW QUESTION # 23
You must implement filter-based forwarding. You need to direct traffic from the 192.168.1.0/24 through vr1 and traffic from 10.210.0.128/26 through vr2.
Which configuration is correct in this scenario?
Answer: B
NEW QUESTION # 24
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,D
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. Reference topics: Junos Enterprise Switching - Layer 2 Security, Configuring and Troubleshooting MACsec on EX Series Switches.
NEW QUESTION # 25
You are using OSPF to advertise the subnets that are used by the Denver and Dallas offices. The routers that are directly connected to the Dallas and Denver subnets are not advertising the connected subnets.
Referring to the exhibit, which two statements are correct? (Choose two.)
Answer: A,B
Explanation:
The routers that are directly connected to the Dallas and Denver subnets are not advertising the connected subnets. This can be resolved by redistributing the connected subnets into OSPF.
Option C suggests to configure and apply a routing policy that redistributes the connected Dallas and Denver subnets. This is correct because redistribution allows routes from one routing protocol to be communicated to another, and in this case, it allows the connected subnets to be advertised through OSPF.
Option D suggests enabling the passive option on the OSPF interfaces that are connected to the Dallas and Denver subnets. This is also correct because in OSPF, a passive interface is an interface that belongs to the OSPF router, but does not send OSPF Hello packets. It's typically used on an interface that you don't want to use for OSPF adjacencies, but you still want to advertise its IP address. Therefore, enabling passive interface can help in advertising the Dallas and Denver subnets.
NEW QUESTION # 26
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