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| Section | Objectives |
|---|---|
| Topic 1: Layer 2 Security | - DHCP snooping - Dynamic ARP inspection - Common Layer 2 attack mitigation - Port security implementation |
| Topic 2: High Availability | - High availability design and integration - VRRP and redundancy protocols |
| Topic 3: IS-IS | - IS-IS configuration and troubleshooting |
| Topic 4: Spanning Tree Protocol | - Convergence issues identification - Port roles interpretation - Bridge priority and port cost optimization - Loop prevention and redundancy - STP topology design and troubleshooting |
| Topic 5: OSPF | - OSPF configuration and troubleshooting |
| Topic 6: BGP | - BGP configuration and troubleshooting |
| Topic 7: Tunnels | - Tunnel technologies |
| Topic 8: Layer 2 Switching or VLANs | - Bridging components - Native VLANs and voice VLANs - VLAN concepts and functionalities - Configuration, monitoring, and troubleshooting - Frame processing - Inter-VLAN routing - Ports and tagging |
| Topic 9: Protocol Independent Routing | - Routing fundamentals |
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NEW QUESTION # 177
Which statement correctly describes the BGP attribute Local Preference?
Answer: C
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 # 178
What does the MAC limiting feature do on EX Series switches?
Answer: D
Explanation:
MAC limiting protects against flooding of the Ethernet switching table (also known as the MAC forwarding table or Layer 2 forwarding table). This feature is enabled on interfaces (ports). MAC limiting sets a limit on the number of MAC addresses that can be learned on a single Layer 2 access port. The MAC limit value in the EX-series switch's default configuration is five MAC addresses. You can configure the MAC limit on an interface, on an interface in a VLAN, or on all interfaces. You can also specify the action to be taken when the MAC limit is exceeded, such as dropping packets, logging messages, or shutting down the interface.
Additionally, you can configure specific "allowed" MAC addresses for the access port. Any MAC address that is not in the list of configured addresses is not learned. Allowed MAC binds MAC addresses to a VLAN so that the address does not get registered outside the VLAN. References:
[EX] How to control MAC address access through Junos OS for EX Series switches1 Configuring MAC Limiting2 Understanding MAC Limiting and MAC Move Limiting3
NEW QUESTION # 179
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?
Answer: C
Explanation:
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.
NEW QUESTION # 180
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 # 181
You are troubleshooting an issue where traffic to 192.168.10.0/24 is being sent to R1 instead of your desired path through R2.
Referring to the exhibit, what is the reason for the problem?
Answer: C
Explanation:
The exhibit shows the output of the command show ip bgp, which displays information about the BGP routes in the routing table. The output shows two routes for the destination 192.168.10.0/24, one from R1 and one from R2.
The route from R1 has a local preference of 200, while the route from R2 has a local preference of 100. Local preference is a BGP attribute that indicates the degree of preference for a route within an autonomous system (AS). A higher local preference means a more preferred route.
BGP uses a best path selection algorithm to choose the best route for each destination among multiple paths. The algorithm compares different attributes of the routes in a specific order of precedence. The first attribute that is compared is weight, which is a Cisco-specific attribute that is local to the router. If the weight is equal or not set, the next attribute that is compared is local preference.
In this case, both routes have the same weight of 0, which means that they are learned from external BGP (eBGP) peers. Therefore, the next attribute that is compared is local preference.
Since R1's route has a higher local preference than R2's route, it is chosen as the best path and installed in the routing table. The other attributes, such as origin code and AS path, are not considered in this case.
NEW QUESTION # 182
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