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| Section | Objectives |
|---|---|
| Topic 1: High Availability | - Configuration, monitoring and troubleshooting - Graceful restart, nonstop active routing - Virtual Chassis, redundant routing engines |
| Topic 2: BGP | - Configuration, monitoring and troubleshooting - BGP concepts, attributes, path selection - IBGP, EBGP, route policies |
| Topic 3: Tunnels | - Configuration, monitoring and troubleshooting - IP-IP, GRE, IPsec tunnels |
| Topic 4: Layer 2 Switching and VLANs | - VLAN concepts, tagging, ports, native VLAN - Configuration, monitoring and troubleshooting - Layer 2 switching concepts and operation - Inter-VLAN routing |
| Topic 5: IS-IS | - Configuration, monitoring and troubleshooting - IS-IS concepts, levels, routing information |
| Topic 6: Spanning Tree Protocol | - Configuration, monitoring and troubleshooting - STP, RSTP, MSTP concepts and operation - Root bridge, port roles and states |
| Topic 7: Layer 2 Security | - Configuration, monitoring and troubleshooting - Layer 2 firewall filters - Dynamic ARP inspection, DHCP snooping - Port security, storm control, MAC limiting |
| Topic 8: Protocol Independent Routing | - Configuration, monitoring and troubleshooting - Static routes, aggregate routes - Routing policy and firewall filters - Routing tables, routing preferences |
| Topic 9: OSPF | - Configuration, monitoring and troubleshooting - Neighbor relationships, route calculation - OSPFv2/v3 concepts, areas, LSA types |
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NEW QUESTION # 158
You are using tunnels in your network. It is important that the routes be specific enough to ensure that the tunnels are established. You need to prevent a route that is new to the network from being used. In this scenario, which type of route should be used?
Answer: D
NEW QUESTION # 159
In RSTP, which three port roles are associated with the discarding state? (Choose three.)
Answer: A,B,C
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 # 160
Which two BGP attributes must be supported by all BGP implementations and must be included in every update? (Choose two.)
Answer: B,C
Explanation:
BGP attributes are properties that BGP uses for route advertisement, path selection, and loop prevention 1
. There are four categories of BGP attributes 1 2 3 :
* Well-known mandatory: Must be recognized by all BGP routers, present in all BGP updates, and passed on to other BGP routers 1 2 3 .
* Well-known discretionary: Supported by all BGP implementations, and are optionally included in BGP updates 1 .
* Optional transitive: May not be supported by all implementations of BGP 1 .
* Optional non-transitive: May not be supported by all implementations of BGP 1 .
The well-known mandatory attributes must be supported by all BGP implementations and must be included in every update 1 2 3 . These include the AS path and next hop attributes 2 3 . Therefore, options A and C are correct.
NEW QUESTION # 161
What is the maximum allowable MTU size for a default GRE tunnel without IPv4 traffic fragmentation?
Answer: D
Explanation:
Explanation
The maximum allowable MTU size for a default GRE tunnel without IPv4 traffic fragmentation is 1476 bytes1. This is because GRE packets are formed by the addition of the original packets and the required GRE headers1. These headers are 24-bytes in length and since these headers are added to the original frame, depending on the original size of the packet we may run into IP MTU problems1. The most common IP MTU is 1500-bytes in length (Ethernet)1. When the tunnel is created, it deducts the 24-bytes it needs to encapsulate the passenger protocols and that is the IP MTU it will use1. For example, if we are forming a tunnel over FastEthernet (IP MTU 1500)the IOS calculates the IP MTU on the tunnel as: 1500-bytes from Ethernet -
24-bytes for the GRE encapsulation = 1476-Bytes1.
NEW QUESTION # 162
Which statement correctly describes the BGP attribute Local Preference?
Answer: A
Explanation:
Local Preference is a well-known BGP attribute used only within an autonomous system (it is not advertised to eBGP peers) to influence the outbound path selection for traffic leaving the AS.
Among multiple paths to the same destination, the path with the higher Local Preference value is preferred by all routers within the AS.
NEW QUESTION # 163
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