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| Section | Objectives |
|---|---|
| Topic 1: Operations and Troubleshooting | - Junos CLI monitoring tools - Troubleshooting routing and switching issues |
| Topic 2: High Availability | - VRRP configuration and behavior - Redundancy concepts in enterprise networks |
| Topic 3: Routing Protocols | - BGP fundamentals and policy control - IS-IS overview - OSPF configuration and troubleshooting |
| Topic 4: Layer 2 Switching Technologies | - Ethernet switching concepts - Spanning Tree Protocol (STP/RSTP/MSTP) - VLANs and trunking |
| Topic 5: Network Services | - Basic multicast concepts - NAT concepts in Junos |
| Topic 6: Routing Policy and Filtering | - Policy statements - Route filtering and preference control |
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NEW QUESTION # 71
Click the Exhibit button. You have three Juniper Networks EX Series Switches in an STP domain as shown in the exhibit. Which statement describes the switch that will be elected as the root bridge?
Answer: A
Explanation:
Root bridge election in Spanning Tree Protocol is governed entirely by the Bridge Identifier, an 8- byte value formed by concatenating the configured bridge priority (the higher-order, more significant portion of the comparison) with the switch's MAC address (used strictly as a tiebreaker when priorities are identical). Every participating switch compares Bridge IDs, and the switch advertising the numerically lowest Bridge ID is elected root. In this exhibit, the three switches have distinctly different priority values -- EX-1 at the Junos/IEEE default of 32768, EX-2 at 8192, and EX-3 at 16384 -- meaning the comparison is decided entirely at the priority stage and never needs to proceed to a MAC address tiebreak at all. Since 8192 is numerically the lowest of the three priority values, EX-2 is elected root bridge purely on the strength of its lower priority, regardless of what its MAC address happens to be. This is precisely why the correct answer cites priority rather than MAC address as the deciding factor: MAC address only becomes relevant as a tiebreaker in the specific case where two or more switches share an identical priority value, which is not the situation presented here. Understanding that priority is evaluated first and is independently sufficient to decide the outcome whenever it differs is a foundational and heavily tested Spanning Tree concept on the JNCIS-ENT exam.
NEW QUESTION # 72
Which two multicast IP addresses are used for link-state update packets? (Choose two.)
Answer: A,D
NEW QUESTION # 73
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.
NEW QUESTION # 74
A number of reports from end users indicate that internal and external communications are intermittent and not reliable. You verified the status of the switch ports and have determined that they are up and operational. You also noticed a very high level of link bandwidth utilization on those same ports. The current topology of the affected environment is shown in the exhibit.
What would be the cause of the reported issues?
Answer: B
NEW QUESTION # 75 
Click the Exhibit button.
A network has three Juniper Networks EX Series Switches connected together. No changes have been made to the default spanning-tree configuration.
Referring to the exhibit, which statement is correct about the root bridge?
Answer: A
Explanation:
Root bridge election is based on comparing each switch's full Bridge Identifier, which combines the bridge priority value with the switch's MAC address, with priority always evaluated first and MAC address serving strictly as a tiebreaker when two or more switches present identical priority values. In this scenario, the network has been left entirely at the default spanning-tree configuration, meaning every switch is operating at the standard IEEE and Junos default bridge priority of 32768; since all three switches share the exact same priority value, the comparison necessarily falls through to the MAC address tiebreak, where the switch with the numerically lowest MAC address wins the election. Comparing the three addresses shown - 00:1a:2b:3c:
4d:01, 00:1a:2b:3c:4d:02, and 00:1a:2b:3c:4d:03 - Switch A's address is the lowest, since only the final octet differs and 01 is less than both 02 and 03, making Switch A the elected root bridge. RSTP uses the identical Bridge ID comparison mechanism as legacy STP for root election, so there is no special 'median MAC address' rule that applies uniquely under RSTP, making that distractor factually invalid regardless of protocol version. The election process also does not require any manual bridge priority configuration to complete; the default priority value is entirely sufficient on its own to allow a deterministic election to occur, since default priorities are still numerically comparable Bridge IDs. Reference topics: Junos Enterprise Switching - Spanning Tree Protocols, Default Priority and MAC Address Tiebreaking.
NEW QUESTION # 76
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