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| Section | Objectives |
|---|---|
| IS-IS | - Levels, areas and metrics - Link-state database and PDUs - Adjacencies and troubleshooting |
| Tunnels | - IP tunneling concepts - GRE and IP-IP configuration and troubleshooting |
| Layer 2 Switching and VLANs | - Native VLANs and voice VLANs - Ports and VLAN tagging - Inter-VLAN routing - Frame processing - Bridging components |
| High Availability | - Link Aggregation Groups and RTG - VRRP, NSR, NSB and BFD - Virtual chassis and graceful restart |
| OSPF | - Areas and LSA types - Router ID, adjacencies and neighbors - Link-state database and packet types |
| Spanning Tree | - STP and RSTP concepts, roles and states - Convergence and reconvergence - Bridge Protocol Data Units (BPDUs) |
| Protocol-Independent Routing | - Static, aggregate, generated routes - Martian addresses and RIB groups - Load balancing and filter-based forwarding |
| BGP | - BGP basic operations and message types - EBGP and IBGP peer interactions - Attributes and path selection |
| Layer 2 Security | - MACsec and storm control - Layer 2 firewall filters - BPDU, loop and root protection - Port security (MAC limiting, DHCP snooping, DAI, IP source guard) |
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NEW QUESTION # 109
What is the default MAC age-out timer on an EX Series switch?
Answer: C
Explanation:
The default MAC age-out timer on an EX Series switch is 300 seconds. The MAC age-out timer is the maximum time that an entry can remain in the MAC table before it "ages out," or is removed.
This configuration can influence efficiency of network resource use by affecting the amount of traffic that is flooded to all interfaces. When traffic is received for MAC addresses no longer in the Ethernet routing table, the router floods the traffic to all interfaces.
NEW QUESTION # 110 
Click the Exhibit button.
You are troubleshooting an aggregated Ethernet interface on a Juniper Networks EX Series Switch. The aggregated Ethernet interface does not appear in the output shown in the exhibit.
Which action will solve this problem?
Answer: C
Explanation:
On EX Series switches, aggregated Ethernet (ae) interfaces do not exist by default; before any ae interface can be created, referenced, or brought into service, an administrator must first reserve the desired number of aggregated Ethernet device slots by configuring set chassis aggregated-devices ethernet device-count number at the [edit chassis] hierarchy. This statement allocates the internal resources needed for that many ae interfaces to exist as valid, configurable objects; until it is committed, any interface-level configuration referencing ae0 (such as the aggregated-ether-options and family ethernet-switching stanzas shown in the exhibit) is accepted syntactically by the CLI but never actually instantiates a live ae0 device, which is exactly why show interfaces ae0.0 returns 'device ae0 not found' despite the interface appearing fully configured.
Increasing the device-count to at least 1 (or higher, to cover the number of LAG bundles planned) immediately resolves this and allows ae0 to appear as an operational interface once its member links are also associated with it. This is a foundational and frequently overlooked prerequisite step in LAG deployment on Juniper switches. There is no separate licensing requirement for aggregated Ethernet functionality on EX Series switches, a reboot is not needed since the chassis statement takes effect upon commit, and the LACP mode (active versus passive) is unrelated to whether the ae interface object itself exists in the first place.
Reference topics: Junos Enterprise Switching - Link Aggregation, Configuring the Aggregated Ethernet Device Count.
NEW QUESTION # 111
Which two statements about BGP facilitate the prevention of routing loops within an autonomous system? (Choose two.)
Answer: A,B
NEW QUESTION # 112 
Click the Exhibit button.
You have two routers on your network that are not able to establish BGP sessions.
Which two statements are correct in this scenario? (Choose two.)
Answer: A,C
Explanation:
The diagnostic output explicitly states the root cause: the local router has only the inet6-unicast address family configured for this peer, while the remote router advertised inet-unicast and inet-vpn-unicast in its OPEN message, and BGP requires at least one common negotiated address family (NLRI type) between two peers for a session to remain established; with zero overlap between the two sides' configured families, the session is torn down immediately after the OPEN exchange, which is precisely why the peer state shows Active rather than Established. This confirms the mismatched-address-family statement directly and unambiguously from the exhibit's own Down reason and Detail reason fields. The diagnostic tool's own embedded Suggestion text goes further, explicitly advising the administrator to additionally verify that the local-address configured for the peer matches the remote router's configured neighbor address and vice versa - a secondary, commonly encountered condition in which mismatched or effectively duplicated/incorrect address bindings between the two sides' neighbor statements can independently prevent a session from completing correctly, even once the family mismatch is resolved. This is why address-configuration consistency between the peers is flagged as a second concern worth checking in this scenario. Nothing in the exhibit references NTP or time synchronization at all, nor does anything in the output reference authentication, an MD5 mismatch, or any related failure signature; both of those conditions would present through entirely different diagnostic messages than the one shown here. Reference topics: Junos Enterprise Routing - BGP, Address Family Negotiation and the show bgp diagnostics neighbor Command.
NEW QUESTION # 113
You are asked to deploy nonstop active routing (NSR) on a dual-Routing Engine platform. In this scenario, what are two additional requirements for proper operation? (Choose two.)
Answer: C,D
Explanation:
Nonstop active routing is specifically engineered to be completely transparent to the rest of the network:
rather than relying on neighboring routers to preserve state during a Routing Engine switchover the way graceful restart does, NSR keeps a fully synchronized instance of the routing protocol process (rpd) running continuously on the backup Routing Engine, mirroring protocol adjacencies, the RIB, and session state in real time. Because neighbors never observe a session reset or restart signal during an NSR-driven switchover, there is no dependency on those neighbors supporting or enabling graceful restart extensions at all - this is the core architectural advantage that distinguishes NSR from GR and is precisely why the first and third answer choices are incorrect distractors. What NSR does require locally is Graceful Routing Engine Switchover (GRES) enabled first, since NSR is built as an extension on top of GRES and depends on it to synchronize kernel and interface state between the two Routing Engines before protocol-level synchronization can occur. Additionally, Juniper's official guidance mandates that both Routing Engines run the identical Junos OS software version; mismatched versions between the primary and backup Routing Engine can introduce incompatible internal data structures or feature behavior during state replication, jeopardizing the integrity of a switchover and is explicitly called out as a hard operational requirement rather than a mere best practice. Reference topics: Junos Enterprise Routing - High Availability, Nonstop Active Routing Requirements and GRES Dependency.
NEW QUESTION # 114
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