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| Section | Objectives |
|---|---|
| Topic 1: High Availability | - VRRP configuration and behavior - Redundancy concepts in enterprise networks |
| Topic 2: Network Services | - Basic multicast concepts - NAT concepts in Junos |
| Topic 3: Operations and Troubleshooting | - Junos CLI monitoring tools - Troubleshooting routing and switching issues |
| Topic 4: Routing Protocols | - OSPF configuration and troubleshooting - BGP fundamentals and policy control - IS-IS overview |
| Topic 5: Layer 2 Switching Technologies | - VLANs and trunking - Ethernet switching concepts - Spanning Tree Protocol (STP/RSTP/MSTP) |
| Topic 6: Routing Policy and Filtering | - Route filtering and preference control - Policy statements |
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NEW QUESTION # 11
You are asked to explore deploying IS-IS in your network. What are two considerations in this scenario? (Choose two.)
Answer: B,D
NEW QUESTION # 12
Referring to the output shown in the exhibit, which statement is correct?
Answer: B
NEW QUESTION # 13
Your company has a branch location that uses a Juniper Networks EX Series Switch. You are asked to troubleshoot a spanning-tree issue that keeps reoccurring within the branch environment. After investigation, you discover that end-devices running a virtualization application are generating BPDUs, which are disrupting the spanning-tree topology and causing periodic outages.
Which solution will prevent this problem from reoccurring?
Answer: C
Explanation:
This scenario describes end hosts - virtualization hosts running software switches or virtual bridging stacks
- unexpectedly generating and transmitting BPDUs on ports that are supposed to be pure edge (host-facing) ports where no BPDUs should ever legitimately be received. BPDU protection (BPDU guard) is the Junos feature purpose-built for exactly this situation: when applied to an edge-designated interface, it continuously monitors that port for any incoming BPDU, and the moment one is detected, it immediately and automatically disables the port, preventing the unexpected BPDU source from ever participating in or influencing the spanning-tree topology calculation, thereby protecting the stable, intended topology from disruption caused by unauthorized or accidental BPDU generation at the access edge. This directly and precisely resolves the described problem at its source, since the root cause is illegitimate BPDUs arriving on ports that were never meant to see them. Increasing the max-age timer only adjusts how long stale topology information is retained before being aged out and has no effect on preventing rogue BPDUs from being processed in the first place.
Disabling RSTP outright on access interfaces would eliminate spanning tree's loop-prevention protection on those ports entirely, introducing a much more severe risk of undetected Layer 2 loops. Root protection (root guard) defends specifically against a port attempting to become the root port by receiving a superior BPDU claiming a better path to root; it addresses a different threat model than blocking any BPDU outright on a true edge port. Reference topics: Junos Enterprise Switching - Spanning Tree Protocols, BPDU Protection on Edge Interfaces.
NEW QUESTION # 14
Refer to Exhibit:
R1 is not responding to ICMP requests sent to the VIP address.
Referring to the exhibit, which command option would you configure on the virtual address to correct this problem?
Answer: D
Explanation:
In this configuration, R1's physical interface address (10.10.10.1) is different from the VRRP virtual IP address (10.100.100.1), meaning R1 is operating as a non-owner VRRP master - it did not originate the virtual address as one of its own real interface addresses. By default, Junos VRRP masters that do not own the virtual address will forward transit traffic destined through that address but will not process or respond to traffic addressed directly to the VIP itself, such as ICMP echo requests, Telnet, or SSH sessions aimed at
10.100.100.1. This is deliberate default behavior intended to prevent ambiguity about which physical device is answering on behalf of a shared virtual identity. To allow the master to accept and respond to packets whose destination is the virtual address itself, the accept-data statement must be explicitly configured under the vrrp- group hierarchy. Once enabled, the elected master will process locally destined traffic sent to the VIP, resolving exactly the symptom described. The track option is used for interface or route-based priority adjustment to influence mastership, advertise-interval tunes the frequency of VRRP hello advertisements, and no-preempt prevents a higher-priority router from reclaiming mastership once a lower-priority router has taken over - none of these affect whether the master processes traffic destined to the VIP. Reference topics:
Junos Enterprise Routing - High Availability, VRRP accept-data Behavior.
NEW QUESTION # 15
Depending on the link type, OSPF sends link-state update packets to which two addresses? (Choose two.)
Answer: B,D
Explanation:
OSPF relies on two IANA-reserved multicast addresses to distribute its control-plane traffic across broadcast and NBMA network types, and Link State Update (LSU) packets, which carry the actual LSAs being flooded, are addressed to one or the other depending on the role of the sending router. The address 224.0.0.5, designated AllSPFRouters, is used when any OSPF router - including a router that is itself the Designated Router or Backup Designated Router - needs to flood an LSU to every OSPF-speaking router on the segment; this is the address used for Hello packets universally and for LSU flooding directed at the entire segment. The address 224.0.0.6, designated AllDRouters, is used specifically by non-DR, non-BDR routers (DROthers) when they need to send an LSU or other update destined for the DR and BDR only, since only the DR and BDR actually listen on this address; the DR then takes responsibility for reflooding that information to the rest of the segment using 224.0.0.5. This two-address design is central to how OSPF achieves flooding efficiency on multi-access networks by funneling updates through the DR rather than requiring full-mesh flooding among every router pair. The addresses 224.0.0.8 and 224.0.0.9 are not used by OSPF at all;
224.0.0.9 is in fact reserved for RIPv2 multicast updates, making it a plausible-looking but incorrect distractor. Reference topics: Junos Enterprise Routing - OSPF, Multicast Addressing for Hello and Link State Update Packets.
NEW QUESTION # 16
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