The Enterprise Routing and Switching, Specialist (JNCIS-ENT) (JN0-352) certification has become a basic requirement to advance rapidly in the information technology sector. Since Enterprise Routing and Switching, Specialist (JNCIS-ENT) (JN0-352) actual dumps are vital to prepare quickly for the examination. Therefore, you will need them if you desire to ace the Enterprise Routing and Switching, Specialist (JNCIS-ENT) (JN0-352) exam in a short time.
| Section | Objectives |
|---|---|
| Topic 1: Layer 2 Security | - BPDU, loop and root protection - MACsec and storm control - Layer 2 firewall filters - Port security (MAC limiting, DHCP snooping, DAI, IP source guard) |
| Topic 2: OSPF | - Link-state database and packet types - Areas and LSA types - Router ID, adjacencies and neighbors |
| Topic 3: Protocol-Independent Routing | - Static, aggregate, generated routes - Martian addresses and RIB groups - Load balancing and filter-based forwarding |
| Topic 4: High Availability | - Virtual chassis and graceful restart - VRRP, NSR, NSB and BFD - Link Aggregation Groups and RTG |
| Topic 5: Layer 2 Switching and VLANs | - Ports and VLAN tagging - Native VLANs and voice VLANs - Frame processing - Bridging components - Inter-VLAN routing |
| Topic 6: Tunnels | - GRE and IP-IP configuration and troubleshooting - IP tunneling concepts |
| Topic 7: BGP | - Attributes and path selection - EBGP and IBGP peer interactions - BGP basic operations and message types |
| Topic 8: IS-IS | - Adjacencies and troubleshooting - Levels, areas and metrics - Link-state database and PDUs |
| Topic 9: Spanning Tree | - Convergence and reconvergence - STP and RSTP concepts, roles and states - Bridge Protocol Data Units (BPDUs) |
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NEW QUESTION # 66
After receiving a BGP route, which two conditions are verified by the receiving router to ensure that the received route is valid? (Choose two)
Answer: C,D
Explanation:
B is correct because the loops do not exist is one of the conditions that are verified by the receiving router to ensure that the received BGP route is valid. A loop in BGP means that a route has been advertised by the same AS more than once, which can cause routing instability and inefficiency. To prevent loops, BGP uses the AS-path attribute, which lists the AS numbers that a route has traversed from the origin to the destination. The receiving router checks the AS-path attribute of the received route and discards it if it finds its own AS number in the list. This way, BGP avoids accepting routes that contain loops.
C is correct because the next hop is reachable is one of the conditions that are verified by the receiving router to ensure that the received BGP route is valid. The next hop is the IP address of the next router that is used to forward packets to the destination network. The receiving router checks the next hop attribute of the received route and verifies that it has a valid route to reach it.
If the next hop is not reachable, the received route is not usable and is rejected by the receiving router. This way, BGP ensures that only feasible routes are accepted.
NEW QUESTION # 67
Which two BGP attributes must be supported by all BGP implementations and must be included in every update? (Choose two.)
Answer: C,D
Explanation:
BGP attributes are properties that BGP uses for route advertisement, path selection, and loop prevention. There are four categories of BGP attributes:
Well-known mandatory: Must be recognized by all BGP routers, present in all BGP updates, and passed on to other BGP routers.
Well-known discretionary: Supported by all BGP implementations, and are optionally included in BGP updates.
Optional transitive: May not be supported by all implementations of BGP.
Optional non-transitive: May not be supported by all implementations of BGP. The well-known mandatory attributes must be supported by all BGP implementations and must be included in every update. These include the AS path and next hop attributes.
NEW QUESTION # 68
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 # 69 
Click the Exhibit button.
You are asked to ensure that there will not be any unwanted STP topology changes affecting your root bridge placement because a rogue switch was introduced into the network at the access layer.
Referring to the exhibit, which interfaces will need to have root protection applied to accomplish this task?
Answer: A
Explanation:
Root protection (root guard) must always be applied on the ports of the switches you trust to remain root- bridge-eligible, specifically on the interfaces facing away from the legitimate root and toward parts of the network where an untrusted or rogue device could plausibly appear and begin transmitting superior BPDUs.
In this topology, Switch-1 is the intended, permanent root bridge (lowest priority, 4k), and Switch-2 is its aggregation-layer peer; both sit above the access layer, where Switch-3 and Switch-4 connect downstream toward end-user-facing infrastructure and where an accidental or malicious rogue switch is realistically most likely to be introduced. The ge-0/0/6 and ge-0/0/8 interfaces on Switch-1 and Switch-2 are precisely the downlink ports facing that access layer, meaning they are the exact points at which a rogue switch's superior BPDU (one advertising a lower priority than the legitimate root) would first be received if such a device appeared beneath Switch-3 or Switch-4. Applying root protection on those specific interfaces causes Junos to immediately block (move to a root-inconsistent, discarding state) any port that receives a superior BPDU, preventing the rogue device from ever being accepted as root, while normal, non-superior BPDUs continue to be processed without disruption. Applying root guard on Switch-1 and Switch-2's peer link (ge-0/0/12/13) would be inappropriate, since that link legitimately connects two trusted, root-eligible switches. Reference topics: Junos Enterprise Switching - Spanning Tree Protocols, Root Protection Placement Strategy.
NEW QUESTION # 70
Which statement is correct about IP-IP tunnels?
Answer: D
Explanation:
"The ENCAPSULATOR does not change the inner IP header, except to decrement the TTL and it remains unchanged during its deliver to the endpoint" - only router that encapsulates the inner packet decrements its TTL - during transit, the inner packet is unchanged.
NEW QUESTION # 71
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