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| Section | Objectives |
|---|---|
| Topic 1: Layer 2 Security | - Layer 2 firewall filters - Port security (MAC limiting, DHCP snooping, DAI, IP source guard) - MACsec and storm control - BPDU, loop and root protection |
| Topic 2: OSPF | - Link-state database and packet types - Router ID, adjacencies and neighbors - Areas and LSA types |
| Topic 3: BGP | - BGP basic operations and message types - EBGP and IBGP peer interactions - Attributes and path selection |
| Topic 4: Protocol-Independent Routing | - Load balancing and filter-based forwarding - Static, aggregate, generated routes - Martian addresses and RIB groups |
| Topic 5: Spanning Tree | - Convergence and reconvergence - Bridge Protocol Data Units (BPDUs) - STP and RSTP concepts, roles and states |
| Topic 6: IS-IS | - Adjacencies and troubleshooting - Levels, areas and metrics - Link-state database and PDUs |
| Topic 7: Layer 2 Switching and VLANs | - Bridging components - Native VLANs and voice VLANs - Inter-VLAN routing - Ports and VLAN tagging - Frame processing |
| Topic 8: Tunnels | - GRE and IP-IP configuration and troubleshooting - IP tunneling concepts |
| Topic 9: High Availability | - VRRP, NSR, NSB and BFD - Virtual chassis and graceful restart - Link Aggregation Groups and RTG |
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NEW QUESTION # 120
Which two fields must match in an OSPF hello packet to form an adjacency over a broadcast link? (Choose two.)
Answer: A,B
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.
NEW QUESTION # 121 
Click the Exhibit button.
You are asked to ensure that there will not be any unwanted STP topology changes affecting your root bridge placement because a rogue switch was introduced into the network at the access layer.
Referring to the exhibit, which interfaces will need to have root protection applied to accomplish this task?
Answer: B
Explanation:
Root protection (root guard) must always be applied on the ports of the switches you trust to remain root- bridge-eligible, specifically on the interfaces facing away from the legitimate root and toward parts of the network where an untrusted or rogue device could plausibly appear and begin transmitting superior BPDUs.
In this topology, Switch-1 is the intended, permanent root bridge (lowest priority, 4k), and Switch-2 is its aggregation-layer peer; both sit above the access layer, where Switch-3 and Switch-4 connect downstream toward end-user-facing infrastructure and where an accidental or malicious rogue switch is realistically most likely to be introduced. The ge-0/0/6 and ge-0/0/8 interfaces on Switch-1 and Switch-2 are precisely the downlink ports facing that access layer, meaning they are the exact points at which a rogue switch's superior BPDU (one advertising a lower priority than the legitimate root) would first be received if such a device appeared beneath Switch-3 or Switch-4. Applying root protection on those specific interfaces causes Junos to immediately block (move to a root-inconsistent, discarding state) any port that receives a superior BPDU, preventing the rogue device from ever being accepted as root, while normal, non-superior BPDUs continue to be processed without disruption. Applying root guard on Switch-1 and Switch-2's peer link (ge-0/0/12/13) would be inappropriate, since that link legitimately connects two trusted, root-eligible switches. Reference topics: Junos Enterprise Switching - Spanning Tree Protocols, Root Protection Placement Strategy.
NEW QUESTION # 122
You are verifying a new BGP peering session with an ISP. You issue the show bgp summary command, but the output shows the peer in the Active state. Which statement is correct in this scenario?
Answer: D
Explanation:
The BGP finite state machine defined in RFC 4271 progresses through Idle, Connect, Active, OpenSent, OpenConfirm, and finally Established. The Active state is entered either directly after Idle, when the local router begins retrying a TCP connection setup toward the configured peer, or after a previous Connect attempt has failed and the ConnectRetry timer has expired, prompting the router to keep trying to complete the underlying TCP three-way handshake. Seeing a peer parked in Active therefore means the local device has a fully valid neighbor configuration and is persistently attempting to reach the remote address on TCP port 179, but the handshake is not succeeding -- common root causes include a firewall or ACL blocking TCP 179 between the two endpoints, an unreachable or incorrect peer IP address, the remote BGP process not running or not listening, or an asymmetric routing path preventing the SYN/ACK from returning. It does not indicate a misconfiguration on the local box in the sense of a missing statement (that would typically leave the session as Idle), nor does it indicate an established, functioning session exchanging UPDATE messages (that state is Established), and it is not a deliberately idle/disabled condition, which Junos reports plainly as Idle. Recognizing Active as 'trying to connect' rather than 'connected' is essential for correct BGP troubleshooting sequencing.
NEW QUESTION # 123
Which IS-IS TLV should be used to advertise information about the router's neighbors and link metrics?
Answer: D
Explanation:
TLV 22, the Extended IS Reachability TLV defined in RFC 5305, is the modern and Junos-preferred mechanism for advertising a router's adjacent neighbors together with the metric associated with each link. It carries the seven-octet system ID and pseudonode number of each neighbor along with a 24-bit wide metric field, and supports an extensible set of sub-TLVs used for traffic-engineering data such as interface and neighbor IP addresses, bandwidth, and administrative groups. The original IS Reachability TLV, TLV 2, defined in the base ISO 10589 standard, carries similar neighbor and metric information but is constrained to a 6-bit narrow metric with a maximum value of 63, which is inadequate for expressing meaningful cost differentiation in modern, high-capacity enterprise and service-provider topologies; consequently, Junos deployments are commonly configured for wide-metrics-only, favoring TLV 22 over the legacy TLV 2 whenever traffic-engineering-capable or simply more granular metric representation is desired. TLV 132, the IP Interface Address TLV, only advertises the IPv4 addresses configured on the originating router's interfaces and carries no neighbor-adjacency or metric information. TLV 129, the Protocols Supported TLV, merely lists which network-layer protocols (such as IPv4 or IPv6) the originating router is capable of routing, and likewise has nothing to do with neighbor reachability or link cost. Reference topics: Junos Enterprise Routing
- IS-IS, Extended IS Reachability and Wide Metrics.
NEW QUESTION # 124
Which two statements about the firewall filter terms shown in the exhibit are true? (Choose two.)
Answer: B,D
NEW QUESTION # 125
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