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| Section | Objectives |
|---|---|
| Routing Protocols | - BGP fundamentals and policy control - OSPF configuration and troubleshooting - IS-IS overview |
| Network Services | - Basic multicast concepts - NAT concepts in Junos |
| Operations and Troubleshooting | - Troubleshooting routing and switching issues - Junos CLI monitoring tools |
| Layer 2 Switching Technologies | - Spanning Tree Protocol (STP/RSTP/MSTP) - Ethernet switching concepts - VLANs and trunking |
| High Availability | - Redundancy concepts in enterprise networks - VRRP configuration and behavior |
| Routing Policy and Filtering | - Route filtering and preference control - Policy statements |
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NEW QUESTION # 136 
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 # 137
You have DHCP snooping enabled but no entries are automatically created in the snooping database for an interface on your EX Series switch. What are two reasons for the problem?
(Choose two.)
Answer: B,C
Explanation:
If the device connected to the interface has performed a DHCPRELEASE, it releases its IP address back to the DHCP server, resulting in the removal of the corresponding DHCP snooping entry.
If the device connected to the interface is using a static IP address, it will not send DHCP requests, and therefore no entries will be created in the DHCP snooping database for that device.
NEW QUESTION # 138
Which two statements are true about high availability on Junos devices? (Choose two.)
Answer: C,D
NEW QUESTION # 139
A host connected to interface ge-0/0/3 on your Juniper Networks EX Series Switch cannot reach another device in the same VLAN. The administrator wants to confirm that the switch has learned the MAC address of the host. Which command should be used to accomplish this task?
Answer: C
Explanation:
The show ethernet-switching table command displays the Layer 2 forwarding database (the bridge or MAC table) that an EX Series switch builds dynamically by inspecting the source MAC address of every frame it receives. Each entry records the learned MAC address, the VLAN it was learned on, the type of entry (dynamic, static, or persistent), and the specific interface through which that address was seen, which is precisely the information needed to confirm whether the switch has learned the host connected to ge-0/0/3. If the host's MAC address is absent from the table, that immediately points to a Layer 1/2 issue -- no frames have been received from the host, a cabling or port problem exists, or the interface is administratively down or blocked by spanning tree -- rather than a Layer 3 routing or VLAN membership problem. show interfaces terse only reports administrative and link state along with any assigned protocol family addresses, offering no MAC-learning visibility. show vlans lists VLAN definitions and their member interfaces but does not display learned host addresses. show interfaces extensive provides detailed physical-layer counters and error statistics, useful for diagnosing frame loss or interface errors, but it does not expose the switching table. For intra-VLAN reachability troubleshooting, verifying MAC learning is always the first and most direct Layer 2 checkpoint.
NEW QUESTION # 140
Click the Exhibit button. Which two statements about the IS-IS output shown in the exhibit are correct? (Choose two.)
Answer: B,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 # 141
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