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| Section | Objectives |
|---|---|
| Spanning Tree Protocol | - Root bridge, port roles and states - STP, RSTP, MSTP concepts and operation - Configuration, monitoring and troubleshooting |
| BGP | - IBGP, EBGP, route policies - BGP concepts, attributes, path selection - Configuration, monitoring and troubleshooting |
| Protocol Independent Routing | - Static routes, aggregate routes - Routing policy and firewall filters - Routing tables, routing preferences - Configuration, monitoring and troubleshooting |
| IS-IS | - IS-IS concepts, levels, routing information - Configuration, monitoring and troubleshooting |
| Tunnels | - IP-IP, GRE, IPsec tunnels - Configuration, monitoring and troubleshooting |
| OSPF | - OSPFv2/v3 concepts, areas, LSA types - Neighbor relationships, route calculation - Configuration, monitoring and troubleshooting |
| High Availability | - Virtual Chassis, redundant routing engines - Graceful restart, nonstop active routing - Configuration, monitoring and troubleshooting |
| Layer 2 Security | - Dynamic ARP inspection, DHCP snooping - Port security, storm control, MAC limiting - Layer 2 firewall filters - Configuration, monitoring and troubleshooting |
| Layer 2 Switching and VLANs | - Inter-VLAN routing - VLAN concepts, tagging, ports, native VLAN - Layer 2 switching concepts and operation - Configuration, monitoring and troubleshooting |
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NEW QUESTION # 65
You are a network operator who wants to add a second ISP connection and remove the default route to the existing ISP You decide to deploy the BGP protocol in the network. What two statements are correct in this scenario? (Choose two.)
Answer: C,D
Explanation:
The rules are as simple as follows:
1. IBGP peers advertise routes received from EBGP peers to other IBGP peers.
2. EBGP peers advertise routes learned from IBGP or EBGP peers to other EBGP peers.
https://community.juniper.net/discussion/understanding-how-ibgpebgp-behaves-in-junos
NEW QUESTION # 66
In RSTP, which three port roles are associated with the discarding state? (Choose three.)
Answer: A,B,D
Explanation:
In Rapid Spanning Tree Protocol (RSTP), there are several port roles that determine the behavior of the port in the spanning tree 1 2 3 . The roles include root, designated, alternate, backup, and disabled 1 2 3 .
The discarding state is associated with the backup, alternate, and disabled roles 1 2 3 . 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 2 . Disabled ports are also in the discarding state 3 .
Therefore, options B, C, and D are correct.
NEW QUESTION # 67
What are two purposes of an aggregate route? (Choose two.)
Answer: A,D
Explanation:
An aggregate route is a route that summarizes multiple more specific routes into a single route advertisement.
For example, an aggregate route to 10.0.0.0/8 can represent many routes to 10.x.x.x/24 subnets. An aggregate route has several purposes, such as:
To decrease the number of route advertisements: By consolidating multiple routes into one, an aggregate route reduces the size of the routing table and the amount of routing updates that need to be exchanged between routers. This can improve the scalability and efficiency of the network12.
To hide internal routes from external peers: By advertising only the aggregate route and not the more specific routes, an aggregate route can provide a level of abstraction and security for the internal network topology. This can prevent external peers from knowing the details of the internal routes and avoid potential attacks or misconfigurations13.
The other options are not correct because:
C). To allow external peers to see internal routes: This is the opposite of what an aggregate route does. An aggregate route hides the internal routes from external peers, not exposes them13.
D). To increase the number of route advertisements: This is also the opposite of what an aggregate route does. An aggregate route decreases the number of route advertisements, not increases them12.
References: Configuring Route Aggregation | Junos OS, JunOS Aggregate and Generate Routes - Network Direction, Aggregate Routes vs Generated Routes. | Junos OS - Juniper Networks
NEW QUESTION # 68
Which statement is correct about graceful Routing Engine switchover (GRES)?
Answer: D
Explanation:
The Graceful Routing Engine Switchover (GRES) feature in Junos OS enables a router with redundant Routing Engines to continue forwarding packets, even if one Routing Engine fails.
GRES preserves interface and kernel information, ensuring that traffic is not interrupted.
However, GRES does not preserve the control plane.
To preserve routing during a switchover, GRES must be combined with either Graceful Restart protocol extensions or Nonstop Active Routing (NSR). When GRES is combined with NSR, nearly
75 percent of line rate worth of traffic per Packet Forwarding Engine remains uninterrupted during GRES. Any updates to the primary Routing Engine are replicated to the backup Routing Engine as soon as they occur.
Therefore, when GRES is combined with NSR, routing is preserved and the new master RE does not restart rpd.
NEW QUESTION # 69
Which statement correctly describes the function of root protection in Junos OS spanning tree implementations?
Answer: D
Explanation:
Root protection is applied to designated ports to enforce the expected root bridge position in the network. If a port configured with root protection receives a superior BPDU that would cause it to become a root port (thus changing the root bridge), the port is placed into a root-inconsistent state and blocked until the superior BPDUs stop being received.
NEW QUESTION # 70
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