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| Section | Objectives |
|---|---|
| Topic 1: Protocol-Independent Routing | - Load balancing and filter-based forwarding - Static, aggregate, generated routes - Martian addresses and RIB groups |
| Topic 2: Layer 2 Switching and VLANs | - Ports and VLAN tagging - Inter-VLAN routing - Frame processing - Native VLANs and voice VLANs - Bridging components |
| Topic 3: OSPF | - Areas and LSA types - Link-state database and packet types - Router ID, adjacencies and neighbors |
| Topic 4: 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 5: Tunnels | - GRE and IP-IP configuration and troubleshooting - IP tunneling concepts |
| Topic 6: IS-IS | - Levels, areas and metrics - Link-state database and PDUs - Adjacencies and troubleshooting |
| Topic 7: High Availability | - VRRP, NSR, NSB and BFD - Virtual chassis and graceful restart - Link Aggregation Groups and RTG |
| Topic 8: Spanning Tree | - Bridge Protocol Data Units (BPDUs) - Convergence and reconvergence - STP and RSTP concepts, roles and states |
| Topic 9: BGP | - BGP basic operations and message types - EBGP and IBGP peer interactions - Attributes and path selection |
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NEW QUESTION # 197
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: A
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 # 198 
Click the Exhibit button.
A network includes several autonomous systems that exchange routing information using BGP. Multiple BGP routes exist for the same prefix.
Referring to the exhibit, which attribute would BGP use first when selecting a preferred route?
Answer: B
Explanation:
The Junos BGP path selection algorithm proceeds through a strict, ordered sequence of comparison steps, and once next-hop reachability and route preference (administrative distance) have been confirmed as equal, local preference is the very first BGP-specific path attribute evaluated in the decision process. A route carrying a higher local preference value is always chosen over a competing route to the same prefix with a lower local preference, and this comparison takes absolute precedence over every subsequent attribute in the algorithm; if local preference values differ between candidate paths, the selection process concludes at this step without ever needing to examine AS path length, origin type, or MED at all. Only when two or more competing paths share an identical local preference value does the algorithm proceed to its third step, comparing AS path length and preferring the shortest, and only after a further tie does it move on to origin type (preferring IGP- origin over EGP-origin, and EGP-origin over incomplete), followed by MED comparison (preferring the lowest value, and only among routes learned from the same neighboring AS by default). Because local preference is evaluated strictly before all three of the other listed attributes, it is the attribute BGP consults first among the choices given, making it the deciding factor in scenarios such as this exhibit where multiple autonomous systems advertise competing paths toward the same 192.168.1.0/24 prefix. Reference topics:
Junos Enterprise Routing - BGP, Understanding BGP Path Selection Order.
NEW QUESTION # 199
You want to redistribute the static routes into BGP, but they do not show as BGP routes.
What causes this result to occur?
Answer: D
NEW QUESTION # 200
You are deploying a trunk port with multiple VLANs. In this scenario, which statement is true about the native VLAN?
Answer: A
NEW QUESTION # 201
Your GRE tunnel is not transitioning to the Upstatus. What would be the first step in troubleshooting the problem?
Answer: D
NEW QUESTION # 202
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