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| Section | Objectives |
|---|---|
| Topic 1: Routing Protocols | - BGP fundamentals and policy control - OSPF configuration and troubleshooting - IS-IS overview |
| Topic 2: High Availability | - VRRP configuration and behavior - Redundancy concepts in enterprise networks |
| Topic 3: Network Services | - NAT concepts in Junos - Basic multicast concepts |
| Topic 4: Routing Policy and Filtering | - Route filtering and preference control - Policy statements |
| Topic 5: Layer 2 Switching Technologies | - Spanning Tree Protocol (STP/RSTP/MSTP) - Ethernet switching concepts - VLANs and trunking |
| Topic 6: Operations and Troubleshooting | - Junos CLI monitoring tools - Troubleshooting routing and switching issues |
JuniperのJN0-352試験の合格書は君の仕事の上で更に一歩の昇進と生活条件の向上を助けられて、大きな財産に相当します。JuniperのJN0-352認定試験はIT専門知識のレベルの考察として、とっても重要な地位になりつつます。Jpexamは最も正確なJuniperのJN0-352試験資料を追求しています。
質問 # 173
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?
正解：C
解説：
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.
質問 # 174
Which two statements describe OSPF DR and BDR behavior? (Choose two.)
正解：B、D
解説：
The Backup Designated Router exists specifically to provide immediate failover redundancy for the Designated Router role on a multi-access broadcast or NBMA segment: the BDR maintains full adjacencies with every other router on the segment concurrently with the DR, precisely so that if the DR ever fails or is withdrawn, the BDR can be promoted directly to DR essentially instantaneously, without needing to wait through a fresh, full DR/BDR election process, and a new BDR election then takes place separately among the remaining DROther routers to fill the now-vacant backup role. This immediate promotion behavior confirms the first statement as correct. The Designated Router's other core responsibility on the segment is originating the Type
2 Network LSA, which describes the multi-access network itself as a pseudonode, listing every router attached to that segment; this LSA type exists specifically to avoid the full-mesh explosion of Router LSA adjacency listings that would otherwise be needed to describe a shared broadcast segment, and only the DR -- never the BDR, and never any DROther -- is responsible for generating and maintaining this particular LSA under normal, stable conditions, which confirms the third statement while directly ruling out the fourth. There is no such thing as the DR 'electing' an area border router; ABR status is instead a role a router acquires organically by having interfaces in more than one OSPF area, entirely independent of any DR/BDR election process on any individual segment.
質問 # 175
You have two OSPF routers forming an adjacency. R1 has a priority of 32 and a router ID of
192.168.1.2. R2 has a priority of 64 and a router ID of 192.168.1.1. The routers were started at the same time and all other OSPF settings are the default settings.
Which statement is correct in this scenario?
正解：C
解説：
The router with the highest OSPF priority becomes the DR. In this case, R2 has a higher priority (64) compared to R1's priority (32). Hence, R2 will become the DR.
The router with the next highest priority becomes the BDR. Since R1 has the next highest priority after R2, R1 will become the BDR.
質問 # 176
You are an operator for a network running IS-IS. Two routers are failing to form an adjacency.
What are two reasons for this problem? (Choose two.)
正解：A、B
解説：
The two reasons for the failure to form an adjacency in a network running IS-IS could be:
B) There is no configured ISO address on any IS-IS interface. IS-IS requires each router interface to have an ISO address configured. Without this address, the routers cannot form an adjacency.
D) The family iso configuration is missing from the adjacency interface. The 'family iso' configuration is essential for IS-IS to function correctly. If this configuration is missing from the adjacency interface, it could prevent the formation of an adjacency.
These explanations are based on the Enterprise Routing and Switching Specialist (JNCIS-ENT) documents and learning resources available at Juniper Networks.
質問 # 177
Which statement is correct about how a Juniper Networks EX Series Switch learns MAC addresses?
正解：B
解説：
Layer 2 MAC learning on an EX Series switch, as on any standard Ethernet bridge, is a passive, frame-driven process rather than an active polling or query-based mechanism. Every time a frame arrives on any interface, the switch inspects the frame's source MAC address field and, if that address is not already present in the Ethernet switching (bridge) table for the associated VLAN, creates a new dynamic entry recording the source MAC address, the VLAN it was learned on, and the specific ingress interface through which the frame arrived. Junos also stamps each learned entry with an aging timestamp, which is refreshed every time a subsequent frame from that same source MAC is received; entries that receive no refreshing traffic within the configured MAC aging interval (300 seconds by default) are eventually purged from the table to keep it current and to reclaim table space from hosts that have moved or gone offline. This source-address-driven, per-frame learning process happens continuously and automatically with no dependency on spanning-tree state changes - although a topology change notification can trigger accelerated aging of the table to flush potentially stale entries faster, learning itself is not gated by or contingent upon such an event occurring. The switch never learns addresses from the destination field of a frame, since the destination address, if already known, is used purely for the forwarding lookup decision, not for populating new table entries. Reference topics: Junos Enterprise Switching - Layer 2 Switching Fundamentals, Source MAC Learning and Table Aging.
質問 # 178
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