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| Section | Objectives |
|---|---|
| Topic 1: 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 |
| Topic 2: Tunnels | - IP tunneling concepts - GRE and IP-IP configuration and troubleshooting |
| Topic 3: BGP | - BGP basic operations and message types - Attributes and path selection - EBGP and IBGP peer interactions |
| Topic 4: IS-IS | - Levels, areas and metrics - Adjacencies and troubleshooting - Link-state database and PDUs |
| Topic 5: Layer 2 Switching and VLANs | - Native VLANs and voice VLANs - Ports and VLAN tagging - Inter-VLAN routing - Bridging components - Frame processing |
| Topic 6: OSPF | - Router ID, adjacencies and neighbors - Areas and LSA types - Link-state database and packet types |
| Topic 7: Protocol-Independent Routing | - Load balancing and filter-based forwarding - Static, aggregate, generated routes - Martian addresses and RIB groups |
| Topic 8: High Availability | - Link Aggregation Groups and RTG - VRRP, NSR, NSB and BFD - Virtual chassis and graceful restart |
| Topic 9: Spanning Tree | - Bridge Protocol Data Units (BPDUs) - Convergence and reconvergence - STP and RSTP concepts, roles and states |
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NEW QUESTION # 82
Which statement describes how nonstop active routing (NSR) maintains routing protocol information during a Routing Engine switchover?
Answer: A
Explanation:
Nonstop active routing's defining architectural feature is that the backup Routing Engine runs a fully live, active instance of the routing protocol daemon (rpd) in parallel with the primary Routing Engine's rpd instance, continuously, from the moment NSR and its prerequisite GRES are established -- not merely at the instant a switchover begins. As protocol adjacencies form, routes are learned, and the RIB is updated on the primary Routing Engine, that same protocol and RIB state is mirrored in real time to the backup Routing Engine's rpd process through an internal synchronization mechanism, so the backup's protocol state remains a live, up-to-date replica of the primary's at essentially every moment during normal operation. When a switchover occurs, the backup Routing Engine simply assumes the primary role with protocol adjacencies, routing tables, and forwarding state already fully populated and current, allowing it to continue operating without re-establishing neighbor relationships or re-learning the network topology, which is what makes the switchover genuinely nonstop and invisible to neighboring routers. This is fundamentally different from graceful restart, where the restarting router must rebuild its state by requesting help from cooperating neighbors after the fact. The Packet Forwarding Engine plays no role in synchronizing protocol-layer information such as LSAs or BGP updates; that is strictly an rpd-to-rpd function coordinated through the Routing Engine synchronization infrastructure.
NEW QUESTION # 83
Which statement is correct about how a Juniper Networks EX Series Switch learns MAC addresses?
Answer: A
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.
NEW QUESTION # 84
Click the Exhibit button. A network has three Juniper Networks EX Series Switches connected together. No changes have been made to the default spanning-tree configuration. Referring to the exhibit, which statement is correct about the root bridge?
Answer: B
Explanation:
Root bridge election is based on comparing each switch's full Bridge Identifier, which combines the bridge priority value with the switch's MAC address, with priority always evaluated first and MAC address serving strictly as a tiebreaker when two or more switches present identical priority values. In this scenario, the network has been left entirely at the default spanning-tree configuration, meaning every switch is operating at the standard IEEE and Junos default bridge priority of 32768; since all three switches share the exact same priority value, the comparison necessarily falls through to the MAC address tiebreak, where the switch with the numerically lowest MAC address wins the election. Comparing the three addresses shown --
00:1a:2b:3c:4d:01, 00:1a:2b:3c:4d:02, and
00:1a:2b:3c:4d:03 -- Switch A's address is the lowest, since only the final octet differs and 01 is less than both 02 and 03, making Switch A the elected root bridge. RSTP uses the identical Bridge ID comparison mechanism as legacy STP for root election, so there is no special 'median MAC address' rule that applies uniquely under RSTP, making that distractor factually invalid regardless of protocol version. The election process also does not require any manual bridge priority configuration to complete; the default priority value is entirely sufficient on its own to allow a deterministic election to occur, since default priorities are still numerically comparable Bridge IDs.
NEW QUESTION # 85
You want to ensure traffic is routed through a GRE tunnel. In this scenario, which two statements will satisfy this requirement? (Choose two.)
Answer: A,D
Explanation:
Option A is correct. For traffic to be sent through a GRE tunnel, there must be a route that directs the traffic into the tunnel. This is typically accomplished through the use of a static route or a dynamic routing protocol.
Option B is correct. All intermediary devices must have a route to the tunnel endpoints. In real- world scenarios, the tunnel endpoints for a tunnel going over the Internet must have globally reachable internet addresses. Otherwise, intermediate routers in the Internet cannot forward the tunneled packets.
NEW QUESTION # 86
Referring to the exhibit, which configuration change is needed for an IS-IS Level 1 adjacency between R1 and R2?
Answer: A
NEW QUESTION # 87
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