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| Section | Objectives |
|---|---|
| Topic 1: Protocol Independent Routing | - Static routes, aggregate routes - Configuration, monitoring and troubleshooting - Routing policy and firewall filters - Routing tables, routing preferences |
| Topic 2: Tunnels | - Configuration, monitoring and troubleshooting - IP-IP, GRE, IPsec tunnels |
| Topic 3: BGP | - BGP concepts, attributes, path selection - Configuration, monitoring and troubleshooting - IBGP, EBGP, route policies |
| Topic 4: Spanning Tree Protocol | - Root bridge, port roles and states - STP, RSTP, MSTP concepts and operation - Configuration, monitoring and troubleshooting |
| Topic 5: OSPF | - OSPFv2/v3 concepts, areas, LSA types - Configuration, monitoring and troubleshooting - Neighbor relationships, route calculation |
| Topic 6: High Availability | - Virtual Chassis, redundant routing engines - Configuration, monitoring and troubleshooting - Graceful restart, nonstop active routing |
| Topic 7: Layer 2 Switching and VLANs | - Layer 2 switching concepts and operation - Inter-VLAN routing - Configuration, monitoring and troubleshooting - VLAN concepts, tagging, ports, native VLAN |
| Topic 8: IS-IS | - Configuration, monitoring and troubleshooting - IS-IS concepts, levels, routing information |
| Topic 9: Layer 2 Security | - Dynamic ARP inspection, DHCP snooping - Configuration, monitoring and troubleshooting - Layer 2 firewall filters - Port security, storm control, MAC limiting |
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질문 # 180
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.)
정답：B,C,E
설명：
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.
질문 # 181
You are configuring an IS-IS IGP network and do not see the IS-IS adjacencies established. In this scenario, what are two reasons for this problem? (Choose two.)
정답：C,D
설명：
Explanation
Option A suggests that the MTU is not at least 1492 bytes. This is correct because IS-IS requires a minimum MTU of 1492 bytes to establish adjacencies1. If the MTU is less than this, IS-IS adjacencies will not be established1.
Option D suggests that the lo0 interface is not included as an IS-IS interface. This is also correct because the loopback interface (lo0) is typically used as the router ID in IS-IS1. If the loopback interface is not included in IS-IS, it could prevent IS-IS adjacencies from being established1.
Therefore, options A and D are correct.
질문 # 182
What is the maximum allowable MTU size for a default GRE tunnel without IPv4 traffic fragmentation?
정답：D
설명：
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.
질문 # 183
You are asked to connect an IP phone and a user computer using the same interface on an EX Series switch.
The traffic from the computer does not use a VLAN tag, whereas the traffic from the IP phone uses a VLAN tag.
Which feature enables the interface to receive both types of traffic?
정답：C
설명：
The feature that enables an interface on an EX Series switch to receive both untagged traffic (from the computer) and tagged traffic (from the IP phone) is the voice VLAN 1 2 .
The voice VLAN feature in EX-series switches enables access ports to accept both data (untagged) and voice (tagged) traffic and separate that traffic into different VLANs 1 2 . This allows the switch to differentiate between voice and data traffic, ensuring that voice traffic can be treated with a higher priority 1 2 . Therefore, option D is correct.
질문 # 184
Referring to the output shown in the exhibit, which statement is correct?
정답：D
설명：
In OSPF, the state of the neighbor relationship is determined by the exchange of OSPF packets between routers. The state "2Way" as shown in the exhibit indicates that bi-directional communication has been established between the two OSPF routers. This is the normal state for a neighbor that is not the Designated Router (DR) or Backup Designated Router (BDR) on a broadcast, non-broadcast multi-access (NBMA), or point-to-multipoint network. These neighbors are often referred to as "DRothers". Therefore, option B is correct.
질문 # 185
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