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| Section | Objectives |
|---|---|
| Topic 1: Layer 2 Security | - Port security (MAC limiting, DHCP snooping, DAI, IP source guard) - Layer 2 firewall filters - MACsec and storm control - BPDU, loop and root protection |
| Topic 2: Protocol-Independent Routing | - Martian addresses and RIB groups - Load balancing and filter-based forwarding - Static, aggregate, generated routes |
| Topic 3: IS-IS | - Adjacencies and troubleshooting - Link-state database and PDUs - Levels, areas and metrics |
| Topic 4: OSPF | - Router ID, adjacencies and neighbors - Link-state database and packet types - Areas and LSA types |
| Topic 5: Layer 2 Switching and VLANs | - Native VLANs and voice VLANs - Inter-VLAN routing - Frame processing - Ports and VLAN tagging - Bridging components |
| Topic 6: Tunnels | - GRE and IP-IP configuration and troubleshooting - IP tunneling concepts |
| Topic 7: BGP | - BGP basic operations and message types - Attributes and path selection - EBGP and IBGP peer interactions |
| Topic 8: High Availability | - Link Aggregation Groups and RTG - VRRP, NSR, NSB and BFD - Virtual chassis and graceful restart |
| Topic 9: Spanning Tree | - STP and RSTP concepts, roles and states - Bridge Protocol Data Units (BPDUs) - Convergence and reconvergence |
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NEW QUESTION # 129
You are asked to change the setting for the LSAs age out back to the default value. In this scenario, which time interval will accomplish this task?
Answer: B
NEW QUESTION # 130
A recent security audit indicates that peer-to-peer applications are allowed on the guest VLAN and employees may have been using the guest VLAN for this purpose. You deploy the configuration shown in the exhibit, but it does not stop the peer-to-peer traffic.
In this scenario, what must you do to implement the security policy?
Answer: D
NEW QUESTION # 131
The ISP1.inet.0 route table has currently no routes in it.
What will happen when you commit the configuration shown on the exhibit?
Answer: D
Explanation:
The configuration shown in the exhibit is an example of a routing instance of type virtual-router. A routing instance is a collection of routing tables, interfaces, and routing protocol parameters that create a separate routing domain on a Juniper device. A virtual-router routing instance allows administrators to divide a device into multiple independent virtual routers, each with its own routing table.
The configuration also includes a rib-group statement, which is used to import routes from one routing table to another. A rib-group consists of an import-rib statement, which specifies the source routing table, and an export-rib statement, which specifies the destination routing table. In this case, the rib-group name is inet-to-ispi, and the import-rib statement specifies inet.0 as the source routing table. The export-rib statement specifies ispi.inet.0 as the destination routing table.
This means that the routes from inet.0 will be imported into ispi.inet.0.
NEW QUESTION # 132
Which two statements about redundant trunk groups on EX Series switches are correct? (Choose two.)
Answer: A,B
Explanation:
Redundant trunk groups are designed to provide link redundancy. If the primary link fails, the secondary link will automatically take over to ensure continued connectivity.
In redundant trunk groups, while regular data traffic is sent over the primary link, Layer 2 control traffic (such as STP, LACP, etc.) is allowed on the secondary link to maintain network stability and protocol operations.
https://www.juniper.net/documentation/us/en/software/junos/multicast-l2/topics/topic-map/redundant-trunk-groups.html
NEW QUESTION # 133 
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 # 134
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