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| Section | Objectives |
|---|---|
| OSPF | - Router ID, adjacencies and neighbors - Areas and LSA types - Link-state database and packet types |
| IS-IS | - Adjacencies and troubleshooting - Link-state database and PDUs - Levels, areas and metrics |
| Spanning Tree | - STP and RSTP concepts, roles and states - Convergence and reconvergence - Bridge Protocol Data Units (BPDUs) |
| High Availability | - Link Aggregation Groups and RTG - Virtual chassis and graceful restart - VRRP, NSR, NSB and BFD |
| Layer 2 Switching and VLANs | - Bridging components - Inter-VLAN routing - Ports and VLAN tagging - Native VLANs and voice VLANs - Frame processing |
| Tunnels | - IP tunneling concepts - GRE and IP-IP configuration and troubleshooting |
| Protocol-Independent Routing | - Martian addresses and RIB groups - Load balancing and filter-based forwarding - Static, aggregate, generated routes |
| Layer 2 Security | - Layer 2 firewall filters - Port security (MAC limiting, DHCP snooping, DAI, IP source guard) - MACsec and storm control - BPDU, loop and root protection |
| BGP | - EBGP and IBGP peer interactions - BGP basic operations and message types - Attributes and path selection |
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NEW QUESTION # 93
Which statement about the default action of MAC limiting is true when the number of MAC addresses has hit the limit set?
Answer: A
NEW QUESTION # 94
Your ISP is announcing a default route to both R1 and R2. You want your network routers to forward all Internet traffic through the R1 device.
Which BGP attribute would you use?
Answer: C
Explanation:
The BGP attribute that you would use to forward all Internet traffic through the R1 device is the local preference.
The local preference is an attribute that is used within an autonomous system (AS) and exchanged between iBGP routers. It is used to select an exit point from the AS. The path with the highest local preference is preferred. By setting a higher local preference for the routes received from R1, you can make R1 the preferred exit point for all Internet traffic.
NEW QUESTION # 95
You are configuring a GRE tunnel between Router A (192.168.1.1) and Router B (192.168.2.1) to connect two isolated networks. The tunnel interfaces (gr-0/0/0) need to support IPv4 traffic.
In this scenario, which configuration ensures the tunnel endpoints are correctly defined and reachable?
Answer: A
Explanation:
A functioning GRE tunnel interface in Junos requires, at minimum, both a tunnel source address and a tunnel destination address configured together under the tunnel statement of the gr- logical unit, since these two values together define the outer, delivery-layer IP header that will encapsulate every passenger packet sent through the tunnel; the source identifies which of the router's own addresses will originate the encapsulated traffic, and the destination identifies the remote tunnel endpoint the encapsulated traffic must be routed toward across the underlying IP network. The first option correctly supplies both required values in a single, complete statement - source 192.168.1.1 (Router A's own address) and destination 192.168.2.1 (Router B's address) - fully defining the tunnel's endpoints and ensuring the encapsulation and route-resolution process can succeed. The fourth option supplies only the destination and omits the source entirely, which is an incomplete configuration; without an explicit source, Junos cannot always reliably determine which local address to use for encapsulation, particularly on multi-address or multi-interface routers, and the tunnel configuration is left non-deterministic or non-functional as shown. The second option enables the IPv6 protocol family on the tunnel's logical unit, which is irrelevant to a scenario explicitly requiring IPv4 passenger traffic support. The third option attempts to assign a family inet address directly using one of the underlying tunnel endpoint addresses, which conflates the tunnel's own transport addressing with logical-unit protocol addressing and does not by itself establish the required source/destination tunnel definition.
Reference topics: Junos Enterprise Routing - Tunneling, Configuring GRE Tunnel Source and Destination.
NEW QUESTION # 96 
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: D
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. Reference topics: Junos Enterprise Switching - Spanning Tree Protocols, Default Priority and MAC Address Tiebreaking.
NEW QUESTION # 97
Referring to the exhibit, what will be the IS-IS adjacency result of the configurations?
Answer: D
NEW QUESTION # 98
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