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| Section | Objectives |
|---|---|
| Topic 1: 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) |
| Topic 2: High Availability | - Virtual chassis and graceful restart - VRRP, NSR, NSB and BFD - Link Aggregation Groups and RTG |
| Topic 3: IS-IS | - Adjacencies and troubleshooting - Levels, areas and metrics - Link-state database and PDUs |
| Topic 4: Tunnels | - GRE and IP-IP configuration and troubleshooting - IP tunneling concepts |
| Topic 5: OSPF | - Link-state database and packet types - Router ID, adjacencies and neighbors - Areas and LSA types |
| Topic 6: BGP | - Attributes and path selection - EBGP and IBGP peer interactions - BGP basic operations and message types |
| Topic 7: Protocol-Independent Routing | - Load balancing and filter-based forwarding - Static, aggregate, generated routes - Martian addresses and RIB groups |
| Topic 8: Spanning Tree | - Convergence and reconvergence - STP and RSTP concepts, roles and states - Bridge Protocol Data Units (BPDUs) |
| Topic 9: Layer 2 Switching and VLANs | - Frame processing - Ports and VLAN tagging - Native VLANs and voice VLANs - Bridging components - Inter-VLAN routing |
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NEW QUESTION # 156
You have two OSPF routers forming an adjacency. R1 has a priority of 32 and a router ID of
192.168.1.2. R2 has a priority of 64 and a router ID of 192.168.1.1. The routers were started at the same time and all other OSPF settings are the default settings.
Which statement is correct in this scenario?
Answer: D
Explanation:
The router with the highest OSPF priority becomes the DR. In this case, R2 has a higher priority (64) compared to R1's priority (32). Hence, R2 will become the DR.
The router with the next highest priority becomes the BDR. Since R1 has the next highest priority after R2, R1 will become the BDR.
NEW QUESTION # 157
A host is connected to your EX Series switch using an interface with persistent MAC learning enabled. When you connect the host to another interface on the same switch, all traffic generated by the host is dropped. Which action should you perform to solve the problem?
Answer: B
NEW QUESTION # 158
Click the Exhibit button. Which two statements about the IS-IS output shown in the exhibit are correct? (Choose two.)
Answer: C,D
Explanation:
This detailed adjacency output shows R3 maintaining four separate, fully Up adjacencies, evenly split between the two IS-IS levels. R1 and R2 are both formed at Level 1, confirming that R3 is directly adjacent to exactly two Level 1 neighbors within its local area, which validates that statement. R4 and R5 are both formed at Level 2, and Level 2 adjacencies are, by definition, part of the IS-IS backbone that interconnects areas; a router maintaining any Level 2 adjacency is by that fact participating in and connected to the Level 2 backbone, confirming R3's backbone connectivity as well. Every one of the four listed adjacencies explicitly shows 'Speaks: IP, IPv6' in its detail output, which is Junos's way of indicating that both the IPv4 and IPv6 address families have been successfully negotiated and are active over that circuit; this directly contradicts, rather than supports, the claim that IPv6 is disabled on these neighbors -- if IPv6 were disabled, the Speaks field would list only IP. Regarding authentication, the output contains no field, flag, or indication whatsoever referencing authentication configuration or state for the R5 adjacency (or any adjacency); Junos would typically surface authentication-related information separately if it were configured and relevant, and its complete absence here means no basis exists in the exhibit to conclude authentication is required for that specific adjacency.
NEW QUESTION # 159
Which two fields must match in an OSPF hello packet to form an adjacency over a broadcast link? (Choose two.)
Answer: A,D
Explanation:
RFC 2328 specifies a precise set of parameters that two OSPF routers on a broadcast network must agree upon before a valid neighbor relationship can be established, and a mismatch in any of these mandatory fields causes the routers to reject each other's Hello packets outright rather than forming even a basic 2-Way state.
The network mask carried in each Hello packet must match between neighbors on a broadcast segment, since OSPF uses this field to confirm both routers agree on the subnet boundaries of the shared segment; a mismatched mask (for example, one router configured with a /24 and its neighbor with a /25 on the same physical wire) is treated as a configuration error and blocks adjacency formation. The router dead interval, which defines how long a router will wait without receiving a Hello before declaring a neighbor down, must likewise match exactly between neighbors, alongside the closely related hello interval, since these timers govern the shared expectations both sides have for how frequently Hellos should arrive and how quickly a failure should be detected; Junos explicitly checks and rejects Hello packets carrying a mismatched dead interval value. Router priority, by contrast, is intentionally allowed to differ between neighbors on the same segment - it exists precisely so that administrators can differentiate router preference for the DR/BDR election, and differing values are expected and normal rather than being blocked. The designated router field, as advertised within each Hello, is informational about the sender's current view of the segment's DR and is not a value that must be identical between the two Hello senders to permit adjacency formation. Reference topics: Junos Enterprise Routing - OSPF, Required Hello Parameter Matching on Broadcast Networks.
NEW QUESTION # 160
Which statement concerning Bidirectional Forwarding Detection (BFD) is true for the configuration shown in the exhibit?
Answer: C
NEW QUESTION # 161
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