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| Section | Objectives |
|---|---|
| Layer 2 Switching and VLANs | - Bridging components - Ports and VLAN tagging - Frame processing - Native VLANs and voice VLANs - Inter-VLAN routing |
| Tunnels | - GRE and IP-IP configuration and troubleshooting - IP tunneling concepts |
| Protocol-Independent Routing | - Load balancing and filter-based forwarding - Martian addresses and RIB groups - Static, aggregate, generated routes |
| OSPF | - Router ID, adjacencies and neighbors - Areas and LSA types - Link-state database and packet types |
| 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) |
| High Availability | - VRRP, NSR, NSB and BFD - Virtual chassis and graceful restart - Link Aggregation Groups and RTG |
| IS-IS | - Adjacencies and troubleshooting - Link-state database and PDUs - Levels, areas and metrics |
| BGP | - EBGP and IBGP peer interactions - Attributes and path selection - BGP basic operations and message types |
| Spanning Tree | - Bridge Protocol Data Units (BPDUs) - STP and RSTP concepts, roles and states - Convergence and reconvergence |
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NEW QUESTION # 156
Referring to the output shown in the exhibit, which statement is correct?
Answer: B
NEW QUESTION # 157
You are asked to explore deploying IS-IS in your network. What are two considerations in this scenario? (Choose two.)
Answer: A,B
NEW QUESTION # 158
What is the purpose of the native VLAN feature on the Juniper Networks EX Series Switches?
Answer: C
Explanation:
A native VLAN is a trunk-port concept, not an access-port concept. On an 802.1Q trunk, every frame is normally expected to carry a VLAN tag identifying its membership; the native VLAN is the single exception that Junos permits an administrator to define using the native-vlan-id statement under the trunk interface's family ethernet-switching hierarchy. Any untagged frame arriving on that trunk port is automatically classified into the configured native VLAN, and conversely, outbound frames belonging to the native VLAN are transmitted untagged rather than with an 802.1Q header. This behavior exists chiefly for interoperability with legacy or third-party devices that either cannot generate 802.1Q tags or intentionally send management or default traffic untagged across an otherwise tagged trunk. Access ports, by definition, only ever carry a single VLAN's traffic and never receive tagged frames in normal operation, so the native VLAN mechanism has no relevance there - which eliminates the access-port-oriented answer choices. The native VLAN also does not restrict a trunk to a single VLAN; the trunk continues to carry all configured tagged VLANs simultaneously, with the native VLAN simply being the designated untagged exception. Misconfiguring or mismatching native VLAN IDs between two trunk peers is a classic Layer 2 troubleshooting scenario on the exam. Reference topics: Junos Enterprise Switching - VLANs, Configuring the Native VLAN on a Trunk Interface.
NEW QUESTION # 159
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. Reference topics: Junos Enterprise Routing - BGP Fundamentals, BGP Finite State Machine and Session Verification.
NEW QUESTION # 160
You need to configure a Juniper Networks EX Series Switch to be able to accept both tagged and untagged traffic on the same access port. Which feature will allow you to accomplish this task?
Answer: C
Explanation:
Voice VLAN is the Junos feature specifically designed to allow a single access port to simultaneously handle two distinct traffic streams: untagged data traffic from a PC or workstation using the port's normal access VLAN, and separately tagged voice traffic generated by an IP telephone that is typically daisy-chained between the switch port and the connected PC. When voice VLAN is configured on an access interface, the switch instructs the attached IP phone (commonly via LLDP-MED) which VLAN ID to tag its voice traffic with, and the switch is then able to correctly classify and prioritize that tagged voice traffic into its designated voice VLAN while simultaneously continuing to treat any untagged frames arriving on that same physical port as belonging to the port's regular, untagged access VLAN -- precisely satisfying the requirement to accept both tagged and untagged traffic together on one access port. Native VLAN, by contrast, is a trunk-port-only concept that designates which VLAN untagged frames on a trunk should be associated with; it has no applicability to an access port and does not enable simultaneous tagged traffic acceptance there. Default VLAN simply refers to the VLAN an interface belongs to absent other configuration and carries no dual- traffic capability. IRB interfaces provide Layer 3 gateway functionality for a VLAN and are unrelated to how tagged versus untagged frames are accepted at Layer 2 on a given physical port.
NEW QUESTION # 161
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