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NEW QUESTION # 99
You have DHCP snooping enabled but no entries are automatically created in the snooping database for an interface on your EX Series switch. What are two reasons for the problem? (Choose two.)
Answer: C,D
Explanation:
Explanation
The DHCP snooping feature in Juniper Networks' EX Series switches works by building a binding database that maps the IP address, MAC address, lease time, binding type, VLAN number, and interface information1. This database is used to filter and validate DHCP messages from untrusted sources1.
However, there are certain conditions that could prevent entries from being automatically created in the snooping database for an interface:
MAC limiting: If MAC limiting is enabled on the interface, it could potentially interfere with the operation of DHCP snooping. MAC limiting restricts the number of MAC addresses that can be learned on a physical interface to prevent MAC flooding attacks1. This could inadvertently limit the number of DHCP clients that can be learned on an interface, thus preventing new entries from being added to the DHCP snooping database.
Static IP address: If the device connected to the interface is configured with a static IP address, it will not go through the DHCP process and therefore will not have an entry in the DHCP snooping database1. The DHCP snooping feature relies on monitoring DHCP messages to build its database1, so devices with static IP addresses that do not send DHCP messages will not have their information added.
Therefore, options B and C are correct. Options A and D are not correct because performing a DHCPRELEASE would simply remove an existing entry from the database1, and Dynamic ARP inspection (DAI) uses the information stored in the DHCP snooping binding database but does not prevent entries from being created1.
NEW QUESTION # 100
Referring to the exhibit, which configuration change is needed for an IS-IS Level 1 adjacency between R1 and R2?
Answer: D
NEW QUESTION # 101
Which statement correctly describes the purpose of a routing policy's "then" clause in Junos OS?
Answer: B
Explanation:
In a Junos OS routing policy, the "then" clause specifies the action to take when a route matches the conditions defined in the "from" clause. Actions can include accepting or rejecting the route, or modifying route attributes such as metric, preference, or community values before the route is accepted or rejected.
NEW QUESTION # 102
In addition to the MAC addresses, what information is stored in the bridging table? (Choose two.)
Answer: C,D
Explanation:
The bridging table is a data structure that stores the MAC addresses and the associated interface details and MAC learned time for each MAC address. The bridging table is used by the switch to forward frames based on the destination MAC address. The ether type details and the preamble of Ethernet packet are not stored in the bridging table, as they are not relevant for the switching process. References:
* Enterprise Routing and Switching, Specialist (JNCIS-ENT) - Juniper Networks
* Enterprise Routing and Switching, Specialist (JNCIS-ENT) - Juniper Networks
* [Junos OS Layer 2 Configuration Guide - TechLibrary - Juniper Networks]
* [Junos OS Layer 2 Configuration Guide - TechLibrary - Juniper Networks]
NEW QUESTION # 103
Your GRE tunnel is not transitioning to the Up status.
What would be the first step in troubleshooting the problem?
Answer: A
NEW QUESTION # 104
......
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