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| Section | Objectives |
|---|---|
| Network Services | - NAT concepts in Junos - Basic multicast concepts |
| High Availability | - VRRP configuration and behavior - Redundancy concepts in enterprise networks |
| Routing Protocols | - IS-IS overview - OSPF configuration and troubleshooting - BGP fundamentals and policy control |
| Layer 2 Switching Technologies | - Spanning Tree Protocol (STP/RSTP/MSTP) - Ethernet switching concepts - VLANs and trunking |
| Operations and Troubleshooting | - Junos CLI monitoring tools - Troubleshooting routing and switching issues |
| Routing Policy and Filtering | - Policy statements - Route filtering and preference control |
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NEW QUESTION # 28
Your BGP neighbors, one in the USA and one in France, are not establishing a connection with each other.
Referring to the exhibit, which statement is correct?
Answer: C
Explanation:
In the configuration shown, BFD (Bidirectional Forwarding Detection) liveness detection is globally configured, but for BFD to work with specific BGP neighbors, it must be configured under each BGP neighbor or BGP group. Without specific BFD configuration at the neighbor or group level, BFD will not be used to monitor the BGP sessions, which might be causing the BGP neighbors not to establish a connection.
NEW QUESTION # 29
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: B
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.
NEW QUESTION # 30
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: C
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 # 31
Which statement is correct about the IS-IS ISO NET address?
Answer: B
Explanation:
An ISO NET address is a type of network address used by the IS-IS routing protocol. It identifies a point of connection to the network, such as a router interface, and is also called a Network Service Access Point (NSAP).
An ISO NET address consists of three parts: an area ID, a system ID, and a selector. The area ID identifies the IS-IS area to which the device belongs. The system ID uniquely identifies the device within the area. The selector identifies a specific service or function on the device, such as routing or management.
An ISO NET address must be unique for each device in the network, because it is used by IS-IS to establish adjacencies, exchange routing information, and compute shortest paths. If two devices have the same ISO NET address, they will not be able to communicate with each other or with other devices in the network. Therefore, it is important to assign different ISO NET addresses to each device in the network.
NEW QUESTION # 32
An update to your organization's network security requirements document requires management traffic to be isolated in a non-default routing-instance. You want to implement this requirement on your Junos-based devices.
Which two commands enable this behavior? (Choose two.)
Answer: A,B
Explanation:
To isolate management traffic in a non-default routing-instance on Junos-based devices, you can use the set system management-instance and set routing-instances mgmt_junos commands. set system management-instance: This command associates the management interface (usually named fxp0 or em0 for Junos OS, or re0:mgmt-* or re1:mgmt-* for Junos OS Evolved) with the non- default virtual routing and forwarding (VRF) instance. After you configure the non-default management VRF instance, management traffic no longer has to share a routing table with other control traffic or protocol traffic.
set routing-instances mgmt_junos: This command creates a new routing instance named mgmt_junos. The name of the dedicated management VRF instance is reserved and hardcoded as mgmt_junos; you cannot configure any other routing instance by the name mgmt_junos.
Therefore, options C and D are correct. Options A and B are not correct because they attempt to assign an interface to the mgmt_junos routing instance, which is not necessary for isolating management traffic.
NEW QUESTION # 33
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