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| Section | Objectives |
|---|---|
| Spanning Tree | - Convergence and reconvergence - Bridge Protocol Data Units (BPDUs) - STP and RSTP concepts, roles and states |
| BGP | - Attributes and path selection - BGP basic operations and message types - EBGP and IBGP peer interactions |
| IS-IS | - Adjacencies and troubleshooting - Link-state database and PDUs - Levels, areas and metrics |
| Layer 2 Switching and VLANs | - Native VLANs and voice VLANs - Bridging components - Frame processing - Ports and VLAN tagging - Inter-VLAN routing |
| High Availability | - VRRP, NSR, NSB and BFD - Link Aggregation Groups and RTG - Virtual chassis and graceful restart |
| 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 |
| Protocol-Independent Routing | - Martian addresses and RIB groups - Load balancing and filter-based forwarding - Static, aggregate, generated routes |
| OSPF | - Router ID, adjacencies and neighbors - Link-state database and packet types - Areas and LSA types |
| Tunnels | - GRE and IP-IP configuration and troubleshooting - IP tunneling concepts |
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NEW QUESTION # 80 
Click the Exhibit button.
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: C
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.
Reference topics: Junos Enterprise Switching - Layer 2 Switching and Firewall Filter Processing Order for Routed VLAN Traffic.
NEW QUESTION # 81
You want to verify prefix information being sent from 10.36.1.4.
Which two statements are correct about the output shown in the exhibit? (Choose two.)
Answer: A,C
Explanation:
The AS path attribute shows AS numbers (e.g., 65401 65520.), indicating the route's traversal through one or various autonomous systems.
The output displays the selected routes and the attributes with which they were received, but does not show the effects of import policy on the routing attributes.
Nothing indicates that the routes have been received from an IBGP peer. The asterisks only indicates whether the routes have been imported into the routing table (RIB) after the application of the import policies.
https://www.juniper.net/documentation/us/en/software/junos/cli-reference/topics/ref/command/show-route-receive-protocol.html
NEW QUESTION # 82
You have enabled MACsec on two directly connected Ethernet devices but MACsec is not working. Which two actions will solve this problem? (Choose two.)
Answer: A,B
Explanation:
MACsec (IEEE 802.1AE) secures a point-to-point Ethernet link independently of how the logical unit above it is configured for VLAN tagging, so neither trunk mode nor access mode has any bearing on whether the MACsec Key Agreement (MKA) protocol can establish a secure channel.
What does determine success is the pre-shared key material: when static CAK security mode is used, the Connectivity Association Key (CAK) and the Connectivity Association Key Name (CKN) must be configured identically on both ends of the link. If they do not match, MKA never completes the exchange, no secure channel is created, and all traffic on that interface is dropped rather than merely left unencrypted. Equally important, and frequently overlooked, is that MACsec adds up to 32 bytes of overhead per frame for the security tag (SecTAG) and integrity check value (ICV); Juniper's official guidance is to ensure the difference between the interface's physical MTU and the protocol MTU is large enough to absorb this overhead, or frames will be silently discarded once encryption is active, producing symptoms that look identical to a failed session.
Both the CAK/CKN and MTU checks are documented first-line troubleshooting steps for MACsec on EX Series switches.
NEW QUESTION # 83
In a LAN segment, which tie-breaker would spanning tree consider if equal-cost paths exist between two or more switches to the root bridge?
Answer: D
NEW QUESTION # 84
Which two statements describe NSR? (Choose two.)
Answer: B,C
NEW QUESTION # 85
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