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| Section | Objectives |
|---|---|
| OSPF | - OSPFv2/v3 concepts, areas, LSA types - Configuration, monitoring and troubleshooting - Neighbor relationships, route calculation |
| Layer 2 Switching and VLANs | - Configuration, monitoring and troubleshooting - VLAN concepts, tagging, ports, native VLAN - Layer 2 switching concepts and operation - Inter-VLAN routing |
| IS-IS | - Configuration, monitoring and troubleshooting - IS-IS concepts, levels, routing information |
| Protocol Independent Routing | - Routing tables, routing preferences - Static routes, aggregate routes - Configuration, monitoring and troubleshooting - Routing policy and firewall filters |
| Layer 2 Security | - Configuration, monitoring and troubleshooting - Layer 2 firewall filters - Port security, storm control, MAC limiting - Dynamic ARP inspection, DHCP snooping |
| Tunnels | - Configuration, monitoring and troubleshooting - IP-IP, GRE, IPsec tunnels |
| BGP | - Configuration, monitoring and troubleshooting - BGP concepts, attributes, path selection - IBGP, EBGP, route policies |
| Spanning Tree Protocol | - Configuration, monitoring and troubleshooting - Root bridge, port roles and states - STP, RSTP, MSTP concepts and operation |
| High Availability | - Graceful restart, nonstop active routing - Configuration, monitoring and troubleshooting - Virtual Chassis, redundant routing engines |
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88. Frage
In RSTP, which three port roles are associated with the discarding state? (Choose three.)
Antwort: A,D,E
Begründung:
In Rapid Spanning Tree Protocol (RSTP), there are several port roles that determine the behavior of the port in the spanning tree. The roles include root, designated, alternate, backup, and disabled.
The discarding state is associated with the backup, alternate, and disabled roles. In a stable topology with consistent port roles throughout the network, RSTP ensures that every root port and designated port immediately transition to the forwarding state while all alternate and backup ports are always in the discarding state. Disabled ports are also in the discarding state.
89. Frage
Which statement is true about the configuration shown in the exhibit?
Antwort: B
90. Frage
Exhibit.
You want to enable redundancy for the EBGP peering between the two routers shown in the exhibit. Which three actions will you perform in this scenario? (Choose three.)
Antwort: A,C,E
Begründung:
A is correct because you need to configure BGP multihop to enable redundancy for the EBGP peering between the two routers. BGP multihop is a feature that allows BGP peers to establish a session over multiple hops, instead of requiring them to be directly connected1. By default, EBGP peers use a time-to-live (TTL) value of 1 for their packets, which means that they can only reach adjacent neighbors1. However, if you configure BGP multihop with a higher TTL value, you can allow EBGP peers to communicate over multiple routers in between1. This can provide redundancy in case of a link failure or a router failure between the EBGP peers.
B is correct because you need to configure loopback interface peering to enable redundancy for the EBGP peering between the two routers. Loopback interface peering is a technique that uses loopback interfaces as the source and destination addresses for BGP sessions, instead of physical interfaces2. Loopback interfaces are virtual interfaces that are always up andreachable as long as the router is operational2. By using loopback interface peering, you can avoid the dependency on a single physical interface or link for the BGP session, and use multiple paths to reach the loopback address of the peer2. This can provide redundancy and load balancing for the EBGP peering.
C is correct because you need to configure routes for the peer loopback interface IP addresses to enable redundancy for the EBGP peering between the two routers. Routes for the peer loopback interface IP addresses are necessary to ensure that the routers can reach each other's loopback addresses over multiple hops2. You can use static routes or dynamic routing protocols to advertise and learn the routes for the peer loopback interface IP addresses2. Without these routes, the routers will not be able to establish or maintain the BGP session using their loopback interfaces.
91. Frage
Which statement is correct about IP-IP tunnels?
Antwort: C
Begründung:
IP-IP tunnels encapsulate IP packets within other IP packets, allowing them to traverse networks that wouldn ' t normally support the original IP packets. This encapsulation involves the TTL (Time-to-Live) of the inner packet being decremented as it traverses through the tunnel towards its endpoint.
92. Frage
Which statement is correct regarding link aggregation groups (LAGs) in Junos OS?
Antwort: A
Begründung:
A Link Aggregation Group (LAG) bundles multiple physical Ethernet links into a single logical interface (ae interface in Junos), increasing available bandwidth and providing redundancy in case one member link fails. While LACP (Link Aggregation Control Protocol) is commonly used to dynamically negotiate and monitor the aggregated links, static LAGs without LACP are also supported.
93. Frage
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