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| Section | Objectives |
|---|---|
| Topic 1: Layer 2 Switching Technologies | - VLANs and trunking - Spanning Tree Protocol (STP/RSTP/MSTP) - Ethernet switching concepts |
| Topic 2: Network Services | - NAT concepts in Junos - Basic multicast concepts |
| Topic 3: Routing Protocols | - OSPF configuration and troubleshooting - IS-IS overview - BGP fundamentals and policy control |
| Topic 4: Routing Policy and Filtering | - Route filtering and preference control - Policy statements |
| Topic 5: Operations and Troubleshooting | - Junos CLI monitoring tools - Troubleshooting routing and switching issues |
| Topic 6: High Availability | - Redundancy concepts in enterprise networks - VRRP configuration and behavior |
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NEW QUESTION # 30
You deployed a new EX Series switch with DHCP snooping enabled and you do not see any entries in the snooping databases for an interface. Which two Juniper configurations for that interface caused this issue? (Choose two.)
Answer: C,D
Explanation:
A is correct because the interface is configured as a disabled port. A disabled port does not forward any traffic, including DHCP packets. Therefore, DHCP snooping cannot learn any MAC addresses or lease information from a disabled port.
C is correct because the interface is configured as a trunk port. By default, all trunk ports on the switch are trusted for DHCP snooping. This means that DHCP snooping does not inspect or filter any DHCP packets received on a trunk port. Therefore, DHCP snooping does not add any entries to the snooping database for a trunk port.
NEW QUESTION # 31
You want to verify prefix information being sent from 10.36.1.4.
Which two statements are correct about the output shown in the exhibit? (Choose two.)
Answer: A,B
Explanation:
The AS path attribute shows AS numbers (e.g., 65401 65520.), indicating the route's traversal through one or various autonomous systems.
The output displays the selected routes and the attributes with which they were received, but does not show the effects of import policy on the routing attributes.
Nothing indicates that the routes have been received from an IBGP peer. The asterisks only indicates whether the routes have been imported into the routing table (RIB) after the application of the import policies.
https://www.juniper.net/documentation/us/en/software/junos/cli-reference/topics/ref/command/show-route-receive-protocol.html
NEW QUESTION # 32 
Click the Exhibit button.
You are troubleshooting an aggregated Ethernet interface on a Juniper Networks EX Series Switch. The aggregated Ethernet interface does not appear in the output shown in the exhibit.
Which action will solve this problem?
Answer: C
Explanation:
On EX Series switches, aggregated Ethernet (ae) interfaces do not exist by default; before any ae interface can be created, referenced, or brought into service, an administrator must first reserve the desired number of aggregated Ethernet device slots by configuring set chassis aggregated-devices ethernet device-count number at the [edit chassis] hierarchy. This statement allocates the internal resources needed for that many ae interfaces to exist as valid, configurable objects; until it is committed, any interface-level configuration referencing ae0 (such as the aggregated-ether-options and family ethernet-switching stanzas shown in the exhibit) is accepted syntactically by the CLI but never actually instantiates a live ae0 device, which is exactly why show interfaces ae0.0 returns 'device ae0 not found' despite the interface appearing fully configured.
Increasing the device-count to at least 1 (or higher, to cover the number of LAG bundles planned) immediately resolves this and allows ae0 to appear as an operational interface once its member links are also associated with it. This is a foundational and frequently overlooked prerequisite step in LAG deployment on Juniper switches. There is no separate licensing requirement for aggregated Ethernet functionality on EX Series switches, a reboot is not needed since the chassis statement takes effect upon commit, and the LACP mode (active versus passive) is unrelated to whether the ae interface object itself exists in the first place.
Reference topics: Junos Enterprise Switching - Link Aggregation, Configuring the Aggregated Ethernet Device Count.
NEW QUESTION # 33
Two Juniper Networks EX Series Switches are connected with four 1-GbE links configured as a single link aggregation group (LAG). One of the physical member links experiences a failure. By default, what impact will this failure have on traffic forwarding between the switches?
Answer: C
Explanation:
A link aggregation group bundles multiple physical Ethernet links into a single logical interface (an ae interface) specifically to provide both increased aggregate bandwidth and link-level redundancy. By default, the aeX interface remains operationally up as long as at least one member link within the bundle remains active and passing traffic; the LAG does not require every member link to be functional to continue operating. When one of the four 1-GbE member links in this scenario fails, LACP (if in use) or the underlying link-status monitoring detects the failure, removes that specific link from the active forwarding set, and redistributes traffic hashing across the three remaining healthy member links automatically and without operator intervention. End devices and upper-layer protocols continue to see a single, continuously up ae interface throughout this process, experiencing only a proportional reduction in available aggregate bandwidth rather than any interruption in connectivity. This default behavior is precisely why LAG is a foundational building block for resilient EX Series switch interconnects in enterprise and data center designs, since it allows individual optic, cable, or transceiver failures to be absorbed transparently. None of the distractor behaviors -- full administrative shutdown of the bundle, forwarding limited to broadcast traffic only, or a temporary disabling of all member links during renegotiation -- reflect actual Junos LAG behavior, which is designed explicitly to avoid any such disruption.
NEW QUESTION # 34 
Click the Exhibit button.
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: A
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.
Reference topics: Junos Enterprise Switching - Layer 2 Switching and Firewall Filter Processing Order for Routed VLAN Traffic.
NEW QUESTION # 35
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