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| Section | Weight | Objectives |
|---|---|---|
| High Availability and Resiliency | 5-10% | - Network resiliency design and troubleshooting - Redundancy protocols and failover mechanisms - Graceful restart and non-stop routing |
| BGP | 15-20% | - Route advertisement, attributes and path selection - Routing policies, filtering and common troubleshooting - Neighbor relationships and session establishment |
| Layer 2 Switching and VLANs | 15-20% | - Spanning Tree Protocol (STP, RSTP, MSTP) operation and configuration - Link Aggregation Groups (LAG) and Virtual Chassis - VLAN concepts, configuration, trunking and tagging |
| Tunnels and Overlays | 5-10% | - Overlay network design and connectivity - GRE, IP-IP and dynamic tunnel configuration - Tunnel types, encapsulation and operation |
| Layer 2 Security | 10-15% | - DHCP snooping, Dynamic ARP Inspection and IP Source Guard - Layer 2 firewall filters and security features - Port security, MAC limiting and storm control |
| OSPF | 15-20% | - Route summarization and redistribution - Configuration, verification and troubleshooting - Neighbor formation, area design and LSA types |
| Protocol Independent Routing | 10-15% | - Routing instances and route selection criteria - Routing tables, static routes and route preference - Basic routing policy and filter operation |
| IP Multicast | 5-10% | - IGMP operation and configuration - Multicast routing monitoring and troubleshooting - PIM Dense Mode, Sparse Mode and RP mechanisms |
| IS-IS | 10-15% | - Adjacency establishment, levels and metrics - Scalable enterprise deployment and troubleshooting - Configuration and route exchange |
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NEW QUESTION # 116
Click the Exhibit button. You configure the aggregate route 172.16.0.0/16 on router R1. The routing table currently contains active routes for 172.16.10.0/24 and 172.16.99.0/24. No other more-specific routes exist. Referring to the exhibit, which statement describes what R1 would do with traffic destined to 172.16.200.5?
Answer: D
Explanation:
The destination address 172.16.200.5 falls within the 172.16.0.0/16 aggregate's summarized range but does not fall within either of the two active, more-specific contributing routes actually present in the table -- 172.16.10.0/24 and 172.16.99.0/24 -- meaning no route more specific than the /16 itself exists to cover it. Under Junos's longest-match forwarding logic, the lookup for
172.16.200.5 therefore resolves to the aggregate route itself, and since aggregate routes are installed by default with a reject next hop rather than any real forwarding path, the router drops the packet and simultaneously generates an ICMP destination-unreachable message back to the originating source, explicitly signaling that no valid path exists for that specific destination even though a covering summary is being advertised. This reject behavior is precisely why aggregate routes are valuable for reducing the number of routes advertised upstream while still providing clear, immediate feedback for traffic aimed at address space within the summary that has no genuine underlying route, rather than silently black-holing it or misdirecting it toward an unrelated contributing route's next hop. The aggregate route itself remains active and installed throughout this process -- a gap in contributing coverage does not deactivate the aggregate, since the aggregate's activation depends only on at least one contributing route being active, which is satisfied here by both existing /24 blocks. There is also no default route present in this scenario to fall back upon.
NEW QUESTION # 117
A host connected to interface ge-0/0/3 on your Juniper Networks EX Series Switch cannot reach another device in the same VLAN. The administrator wants to confirm that the switch has learned the MAC address of the host.
Which command should be used to accomplish this task?
Answer: A
Explanation:
The show ethernet-switching table command displays the Layer 2 forwarding database (the bridge or MAC table) that an EX Series switch builds dynamically by inspecting the source MAC address of every frame it receives. Each entry records the learned MAC address, the VLAN it was learned on, the type of entry (dynamic, static, or persistent), and the specific interface through which that address was seen, which is precisely the information needed to confirm whether the switch has learned the host connected to ge-0/0/3. If the host's MAC address is absent from the table, that immediately points to a Layer 1/2 issue - no frames have been received from the host, a cabling or port problem exists, or the interface is administratively down or blocked by spanning tree - rather than a Layer 3 routing or VLAN membership problem. show interfaces terse only reports administrative and link state along with any assigned protocol family addresses, offering no MAC-learning visibility. show vlans lists VLAN definitions and their member interfaces but does not display learned host addresses. show interfaces extensive provides detailed physical-layer counters and error statistics, useful for diagnosing frame loss or interface errors, but it does not expose the switching table. For intra- VLAN reachability troubleshooting, verifying MAC learning is always the first and most direct Layer 2 checkpoint. Reference topics: Junos Enterprise Switching - Layer 2 Switching Fundamentals, Monitoring the Ethernet Switching Table.
NEW QUESTION # 118
An update to your organization's network security requirements document requires management traffic to be isolated in a non-default routing-instance. You want to implement this requirement on your Junos-based devices.
Which two commands enable this behavior? (Choose two.)
Answer: A,C
Explanation:
To isolate management traffic in a non-default routing-instance on Junos-based devices, you can use the set system management-instance and set routing-instances mgmt_junos commands. set system management-instance: This command associates the management interface (usually named fxp0 or em0 for Junos OS, or re0:mgmt-* or re1:mgmt-* for Junos OS Evolved) with the non- default virtual routing and forwarding (VRF) instance. After you configure the non-default management VRF instance, management traffic no longer has to share a routing table with other control traffic or protocol traffic.
set routing-instances mgmt_junos: This command creates a new routing instance named mgmt_junos. The name of the dedicated management VRF instance is reserved and hardcoded as mgmt_junos; you cannot configure any other routing instance by the name mgmt_junos.
Therefore, options C and D are correct. Options A and B are not correct because they attempt to assign an interface to the mgmt_junos routing instance, which is not necessary for isolating management traffic.
NEW QUESTION # 119
Which statement is correct about GRE tunnels?
Answer: A
NEW QUESTION # 120
Which two statements are correct about IS-IS? (Choose two.)
Answer: A,C
NEW QUESTION # 121
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