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| Section | Objectives |
|---|---|
| Network Services | - NAT concepts in Junos - Basic multicast concepts |
| Layer 2 Switching Technologies | - Spanning Tree Protocol (STP/RSTP/MSTP) - Ethernet switching concepts - VLANs and trunking |
| Routing Policy and Filtering | - Policy statements - Route filtering and preference control |
| Operations and Troubleshooting | - Junos CLI monitoring tools - Troubleshooting routing and switching issues |
| High Availability | - VRRP configuration and behavior - Redundancy concepts in enterprise networks |
| Routing Protocols | - BGP fundamentals and policy control - OSPF configuration and troubleshooting - IS-IS overview |
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NEW QUESTION # 209
Your company has a branch location that uses a Juniper Networks EX Series Switch. You are asked to troubleshoot a spanning-tree issue that keeps reoccurring within the branch environment. After investigation, you discover that end-devices running a virtualization application are generating BPDUs, which are disrupting the spanning-tree topology and causing periodic outages.
Which solution will prevent this problem from reoccurring?
Answer: C
Explanation:
This scenario describes end hosts - virtualization hosts running software switches or virtual bridging stacks
- unexpectedly generating and transmitting BPDUs on ports that are supposed to be pure edge (host-facing) ports where no BPDUs should ever legitimately be received. BPDU protection (BPDU guard) is the Junos feature purpose-built for exactly this situation: when applied to an edge-designated interface, it continuously monitors that port for any incoming BPDU, and the moment one is detected, it immediately and automatically disables the port, preventing the unexpected BPDU source from ever participating in or influencing the spanning-tree topology calculation, thereby protecting the stable, intended topology from disruption caused by unauthorized or accidental BPDU generation at the access edge. This directly and precisely resolves the described problem at its source, since the root cause is illegitimate BPDUs arriving on ports that were never meant to see them. Increasing the max-age timer only adjusts how long stale topology information is retained before being aged out and has no effect on preventing rogue BPDUs from being processed in the first place.
Disabling RSTP outright on access interfaces would eliminate spanning tree's loop-prevention protection on those ports entirely, introducing a much more severe risk of undetected Layer 2 loops. Root protection (root guard) defends specifically against a port attempting to become the root port by receiving a superior BPDU claiming a better path to root; it addresses a different threat model than blocking any BPDU outright on a true edge port. Reference topics: Junos Enterprise Switching - Spanning Tree Protocols, BPDU Protection on Edge Interfaces.
NEW QUESTION # 210
A GRE tunnel is experiencing fragmentation issues. You confirm that the tunnel is up and is functioning correctly. You confirm that hosts are sending 1500-byte packets.
In this scenario, which statement is correct?
Answer: B
Explanation:
GRE encapsulation adds a fixed 24 bytes of overhead to every packet it carries - 4 bytes for the GRE header itself and 20 bytes for the new outer IPv4 delivery header. When a host transmits a full 1500-byte Ethernet payload into a gr- interface, the resulting encapsulated packet becomes 1524 bytes, which exceeds the physical interface's standard 1500-byte MTU and forces fragmentation or drops if the don't-fragment bit is set.
The correct remediation is to reduce the effective MTU seen by end hosts so that encapsulated packets never exceed the physical link's transmission limit. Junos automatically applies this logic to gr- logical interfaces, which default to a 1476-byte protocol MTU (1500 minus 24), but when the underlying physical interface or a manually configured path is involved, administrators must explicitly size the interface MTU to 1476 bytes to prevent post-encapsulation oversize packets. Allowing fragmentation with clear-dont-fragment is a workaround that increases CPU load and can degrade performance rather than solving the root cause, BFD addresses link-failure detection rather than MTU sizing, and ToS copying affects only the type-of-service byte, not packet length. Reference topics: Junos Enterprise Routing - Tunneling, GRE Encapsulation and MTU Considerations; Junos OS Configuring GRE Tunnel Interfaces.
NEW QUESTION # 211
Which two statements describe NSR? (Choose two.)
Answer: A,B
NEW QUESTION # 212
Referring to the exhibit, all possible firewall filters are configured along the path from Server A to Server B. In which order will Switch 1 process transmit (Tx) and receive (Rx) firewall filters?
Answer: B
Explanation:
Because Server A resides in VLAN 10 and Server B resides in VLAN 20, traffic between them cannot remain a purely Layer 2 switched flow; it must be routed between the two VLANs, which on Switch 1 means the packet traverses the switch's internal routing engine (via an IRB interface) between the ingress and egress switching stages. Junos processes firewall filters along this path in a strict, layered order that mirrors the packet's actual journey through the device. First, any filter applied at the physical ingress port level (Rx-Port) is evaluated as the frame first arrives on ge-0/0/10. Next, any filter applied to the ingress VLAN (Rx-VLAN, i.e., VLAN 10) is evaluated as the frame is classified into its source broadcast domain. Because the destination subnet requires routing, the packet is then handed to the routing engine, where any input/ingress routed filter (Rx- Router) applied to the receiving IRB interface is evaluated next, followed by any output/egress routed filter (Tx-Router) applied as the now-routed packet is handed from the routing engine back out toward VLAN 20. Finally, the packet passes through any egress VLAN filter (Tx-VLAN, for VLAN 20) and then the egress physical port filter (Tx-Port) on ge-0/0/20 immediately before transmission to Server B. This complete six-stage sequence -- Rx-Port, Rx-VLAN, Rx-Router, Tx- Router, Tx-VLAN, Tx-Port -- reflects every filter-evaluation checkpoint a routed, inter-VLAN packet passes through on an EX Series Layer 3 switch.
NEW QUESTION # 213
Click the Exhibit button. You want the RSTP primary root path from switch C to traverse switch B.
Referring to the exhibit, which solution will accomplish this task?
Answer: C
Explanation:
Switch A is already fixed as the root bridge in this topology (priority 0), so the outcome being engineered here is not about root bridge election at all, but about which of Switch C's two available paths toward that already-established root -- the direct C-to-A link, or the indirect C-to- B-to-A path -- RSTP selects as the lower-cost, primary path. RSTP's path-cost calculation for any non-root switch sums the port costs of every link along a candidate path to the root and always selects whichever candidate path has the lowest total accumulated cost as that switch's active root path, placing the corresponding local port into the forwarding root port role while any higher- cost alternative path is placed into a non-forwarding (alternate) role. To force Switch C to prefer routing through Switch B rather than connecting to Switch A directly, the administrator must make the direct C-to-A link's cost higher than the combined cost of the C-to-B link plus the B-to-A link added together, so that the indirect, two-hop path through Switch B mathematically totals to a lower cumulative cost than the single direct hop, causing RSTP's cost comparison to favor the indirect path as primary. Setting Switch B's priority (to either 1 or 0) is irrelevant here, since Switch B is not a root bridge candidate in this scenario and priority manipulation would only affect a root bridge election, not path cost preference between a fixed root and a downstream switch.
Lowering the direct link's cost, the inverse of the correct answer, would instead reinforce the direct path rather than override it.
NEW QUESTION # 214
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