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| Section | Objectives |
|---|---|
| Topic 1: Spanning Tree | - STP and RSTP concepts, roles and states - Bridge Protocol Data Units (BPDUs) - Convergence and reconvergence |
| Topic 2: OSPF | - Areas and LSA types - Router ID, adjacencies and neighbors - Link-state database and packet types |
| Topic 3: Protocol-Independent Routing | - Static, aggregate, generated routes - Martian addresses and RIB groups - Load balancing and filter-based forwarding |
| Topic 4: Layer 2 Switching and VLANs | - Bridging components - Native VLANs and voice VLANs - Inter-VLAN routing - Ports and VLAN tagging - Frame processing |
| Topic 5: High Availability | - Link Aggregation Groups and RTG - VRRP, NSR, NSB and BFD - Virtual chassis and graceful restart |
| Topic 6: Tunnels | - IP tunneling concepts - GRE and IP-IP configuration and troubleshooting |
| Topic 7: Layer 2 Security | - BPDU, loop and root protection - MACsec and storm control - Layer 2 firewall filters - Port security (MAC limiting, DHCP snooping, DAI, IP source guard) |
| Topic 8: BGP | - Attributes and path selection - EBGP and IBGP peer interactions - BGP basic operations and message types |
| Topic 9: IS-IS | - Levels, areas and metrics - Link-state database and PDUs - Adjacencies and troubleshooting |
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NEW QUESTION # 55
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 # 56
Referring to the exhibit, all users connected to the same VLAN can communicate with each other, but not with users on other VLANs in this network.
What must be configured to enable communication between the VLANs?
Answer: A
NEW QUESTION # 57
Which two statements are correct about IS-IS? (Choose two.)
Answer: A,B
NEW QUESTION # 58
Which two statements are correct about BGP local preference? (Choose two.)
Answer: A,D
Explanation:
Local preference is a well-known, discretionary BGP path attribute carried exclusively in IBGP UPDATE messages, and Junos assigns every route a local preference value of 100 by default whenever a route is received without an explicit LOCAL_PREF value already attached, or when the attribute has not been otherwise modified through routing policy. This default of 100 becomes the implicit baseline against which any administrator-configured local preference adjustments are compared. Because higher local preference values are always preferred over lower ones during BGP best-path selection -- and this evaluation happens before AS path length, origin, or MED are ever considered -- network engineers commonly use local preference specifically to steer outbound traffic leaving the autonomous system toward a preferred exit peer or upstream provider, by assigning a higher local preference to routes learned from that preferred peer relative to routes learned from alternative peers, making the third statement correct as well. Local preference is explicitly excluded from advertisement to EBGP peers under the BGP specification; it is meaningful only within the boundaries of a single AS and is stripped before a route crosses an AS boundary outward, since a neighboring AS has no reason to trust or honor another organization's internal preference values. A local preference of 0 does not have any special 'drop' semantics in BGP -- it is simply the lowest possible numeric preference value and is treated like any other value during comparison, not as a discard instruction.
NEW QUESTION # 59 
You need to apply a Layer 2 firewall filter on a Juniper Networks EX Series Switch to block traffic from the source MAC address 00:12:34:56:00:07 entering the switch on ge-0/0/3. After committing the configuration, traffic from the MAC address still passes through.
Referring to the exhibit, which statement is correct in this scenario?
Answer: B
Explanation:
The intent of this filter is to match and discard traffic from one single, specific host MAC address, which requires the source-mac-address match condition to reference the complete, exact 48-bit address using an explicit /48 mask (or no mask at all, which Junos treats as an implicit full match) so that only that one precise address is matched. As configured, the term instead specifies a /40 mask on 00:12:34:56:00:07, meaning only the first 40 bits (the first five octets, 00:12:34:56:00) are actually significant to the match, while the sixth octet is effectively wildcarded across its full range; this produces an imprecise, overly broad match criterion rather than the single-host match the administrator intended, and is a common configuration mistake that undermines the predictability and correctness of MAC-based filtering. The lesson tested here is that source and destination MAC address match conditions in Junos firewall filters must be specified with the correct, deliberate, and explicit prefix length appropriate to the intended scope - typically /48 for a single exact host
- rather than an arbitrary or miscalculated mask value. Firewall filters under family ethernet-switching are fully capable of matching on both source-mac-address and destination-mac-address, which rules out that option entirely. Layer 2 MAC-based filters function correctly on both access and trunk interface modes, so interface type is not a limiting factor here. There is no indication in the exhibit that the filter's application direction (input versus output) is reversed. Reference topics: Junos Enterprise Switching - Layer 2 Security, MAC Address Match Conditions and Prefix Length Precision.
NEW QUESTION # 60
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