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| Section | Objectives |
|---|---|
| Protocol-Independent Routing | - Load balancing and filter-based forwarding - Static, aggregate, generated routes - Martian addresses and RIB groups |
| OSPF | - Areas and LSA types - Link-state database and packet types - Router ID, adjacencies and neighbors |
| High Availability | - Link Aggregation Groups and RTG - Virtual chassis and graceful restart - VRRP, NSR, NSB and BFD |
| Layer 2 Switching and VLANs | - Inter-VLAN routing - Bridging components - Ports and VLAN tagging - Frame processing - Native VLANs and voice VLANs |
| BGP | - Attributes and path selection - EBGP and IBGP peer interactions - BGP basic operations and message types |
| Spanning Tree | - STP and RSTP concepts, roles and states - Convergence and reconvergence - Bridge Protocol Data Units (BPDUs) |
| IS-IS | - Link-state database and PDUs - Levels, areas and metrics - Adjacencies and troubleshooting |
| Tunnels | - IP tunneling concepts - GRE and IP-IP configuration and troubleshooting |
| Layer 2 Security | - Port security (MAC limiting, DHCP snooping, DAI, IP source guard) - MACsec and storm control - Layer 2 firewall filters - BPDU, loop and root protection |
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NEW QUESTION # 33
Which statement is correct about how a Juniper Networks EX Series Switch learns MAC addresses?
Answer: D
Explanation:
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.
NEW QUESTION # 34
What are two reasons for creating multiple areas in OSPF? (Choose two.)
Answer: A,C
Explanation:
Option A is correct. Creating multiple areas in OSPF can help to reduce the convergence time .
This is because changes in one area do not affect other areas, so fewer routers need to run the SPF algorithm in response to a change.
Option D is correct. Creating multiple areas in OSPF can help to reduce Link State Advertisement (LSA) flooding across the network. This is because LSAs are not flooded out of their area of origin.
NEW QUESTION # 35
Click the Exhibit button. Which three statements about this BGP session are correct? (Choose three.)
Answer: B,D,E
Explanation:
The show route advertising-protocol bgp command displays exactly what would be transmitted to a specific BGP neighbor after all configured export routing policy has already been evaluated and applied, meaning any prefixes shown in this output have successfully passed through the export policy chain -- confirming the export routing policy has been processed. The command header explicitly states '7 destinations, 7 routes (7 active, ...)' and every listed prefix is preceded by an asterisk, Junos's standard marker for an active route, confirming all seven displayed routes are active in the local routing table. The routing table name shown, XYZ.inet.0, indicates these routes reside in a named routing instance called XYZ rather than the default master routing instance, whose table would instead be labeled simply inet.0; this rules out the statement claiming the routes belong to the default instance. The AS path column shows only the origin code 'I' (IGP) with no AS numbers prepended ahead of it, meaning the AS path is empty, which indicates these prefixes were originated locally within R1's own AS (through redistribution or local origination) rather than having been learned from and passed through an external AS, ruling out that statement as well. Finally, the Nexthop column explicitly shows 'Self' for every route rather than an actual peer or learned address, confirming R1 is rewriting the next-hop attribute to its own address before advertising -- a deliberate next-hop-self policy action typically applied toward IBGP peers.
NEW QUESTION # 36
You are receiving multiple BGP routes from an upstream neighbor and only want to advertise a single summarized prefix to your internal OSPF neighbors. This route should only be advertised when you are receiving these BGP routes from this neighbor.
In this scenario, which type of route should you create?
Answer: D
NEW QUESTION # 37
What are two interarea OSPF LSA types? (Choose two.)
Answer: B,D
NEW QUESTION # 38
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