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| Section | Objectives |
|---|---|
| Layer 2 Security | - Dynamic ARP inspection, DHCP snooping - Port security, storm control, MAC limiting - Layer 2 firewall filters - Configuration, monitoring and troubleshooting |
| OSPF | - Configuration, monitoring and troubleshooting - Neighbor relationships, route calculation - OSPFv2/v3 concepts, areas, LSA types |
| IS-IS | - IS-IS concepts, levels, routing information - Configuration, monitoring and troubleshooting |
| Tunnels | - IP-IP, GRE, IPsec tunnels - Configuration, monitoring and troubleshooting |
| Layer 2 Switching and VLANs | - Inter-VLAN routing - Layer 2 switching concepts and operation - Configuration, monitoring and troubleshooting - VLAN concepts, tagging, ports, native VLAN |
| BGP | - IBGP, EBGP, route policies - Configuration, monitoring and troubleshooting - BGP concepts, attributes, path selection |
| High Availability | - Configuration, monitoring and troubleshooting - Graceful restart, nonstop active routing - Virtual Chassis, redundant routing engines |
| Protocol Independent Routing | - Static routes, aggregate routes - Routing policy and firewall filters - Configuration, monitoring and troubleshooting - Routing tables, routing preferences |
| Spanning Tree Protocol | - Configuration, monitoring and troubleshooting - Root bridge, port roles and states - STP, RSTP, MSTP concepts and operation |
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NEW QUESTION # 35
Which two multicast IP addresses are used for link-state update packets? (Choose two.)
Answer: C,D
Explanation:
Link-state update packets are used to flood link-state advertisements (LSAs) among OSPF routers. The destination IP address of these packets depends on the network type and the state of the interface. On broadcast and point-to-point networks, OSPF uses two IP multicast addresses: 224.0.0.5 for all OSPF routers and 224.0.0.6 for all designated routers (DRs) and backup designated routers (BDRs)12. If the interface state is DR or BDR, the link-state update packets are sent to 224.0.0.5. Otherwise, they are sent to 224.0.0.63. On non-broadcast networks, such as Frame Relay or ATM, link-state update packets are sent as unicasts to each adjacent neighbor3. Therefore, the correct answer is A and D. References: Understanding OSPF Areas | Junos OS, How OSPF Works - IP Routing [Book] - O'Reilly Media, Link state packet - Wikipedia
NEW QUESTION # 36
Which two statements are correct about the Junos OS "load balancing" per-packet feature using an equal-cost multipath (ECMP) policy? (Choose two.)
Answer: C,D
Explanation:
Equal-cost multipath (ECMP) allows traffic to be distributed across multiple paths of equal cost toward the same destination, improving link utilization and providing redundancy. In Junos OS, a routing policy with the "load-balance per-packet" action must typically be applied to the forwarding table to enable this per-flow (or per-packet) load balancing behavior across the equal-cost paths, and ECMP can be used with multiple protocols, including OSPF and BGP.
NEW QUESTION # 37
Which two BGP attributes must be supported by all BGP implementations and must be included in every update? (Choose two.)
Answer: A,C
Explanation:
Explanation
BGP attributes are properties that BGP uses for route advertisement, path selection, and loop prevention1. There are four categories of BGP attributes123:
Well-known mandatory: Must be recognized by all BGP routers, present in all BGP updates, and passed on to other BGP routers123.
Well-known discretionary: Supported by all BGP implementations, and are optionally included in BGP updates1.
Optional transitive: May not be supported by all implementations of BGP1.
Optional non-transitive: May not be supported by all implementations of BGP1.
The well-known mandatory attributes must be supported by all BGP implementations and must be included in every update123. These include the AS path and next hop attributes23. Therefore, options A and C are correct.
NEW QUESTION # 38
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: C,D
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 1 2 .
* 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 1 . 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 1 .
* 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 1 .
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 1 .
NEW QUESTION # 39
Which statement is correct about the IS-IS ISO NET address?
Answer: C
Explanation:
An ISO NET address is a type of network address used by the IS-IS routing protocol. It identifies a point of connection to the network, such as a router interface, and is also called a Network Service Access Point (NSAP).
An ISO NET address consists of three parts: an area ID, a system ID, and a selector. The area ID identifies the IS-IS area to which the device belongs. The system ID uniquely identifies the device within the area. The selector identifies a specific service or function on the device, such as routing or management.
An ISO NET address must be unique for each device in the network, because it is used by IS-IS to establish adjacencies, exchange routing information, and compute shortest paths. If two devices have the same ISO NET address, they will not be able to communicate with each other or with other devices in the network. Therefore, it is important to assign different ISO NET addresses to each device in the network.
NEW QUESTION # 40
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