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| Section | Objectives |
|---|---|
| Topic 1: Layer 2 Security | - Switch security features
|
| Topic 2: Layer 3 Routing Fundamentals | - Routing concepts
|
| Topic 3: Tunneling Technologies | - IP tunneling
|
| Topic 4: High Availability | - Redundancy mechanisms
|
| Topic 5: Layer 2 Switching | - VLANs and trunking
|
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NEW QUESTION # 26
Which mechanism is used to share routes between routing tables?
Answer: B
NEW QUESTION # 27
You are deploying an EX Series switch with a Wi-Fi access point. The access point needs all untagged traffic to use a specific VLAN.
In this scenario, which feature should you enable on the switch port?
Answer: D
Explanation:
According to the Juniper documentation1, a native VLAN is a VLAN that carries untagged traffic on a trunk port. A Wi-Fi access point may need a native VLAN to associate untagged traffic with a specific VLAN, such as the management VLAN. On Juniper EX Series switches, you can enable a native VLAN on a switch port by setting the interface-mode to trunk and specifying a native-vlan-id. For example, the following configuration enables a native VLAN with ID 1 on the switch port ge-0/0/12:
set interfaces ge-0/0/1 unit 0 family ethernet-switching interface-mode trunk set interfaces ge-0/0/1 unit 0 family ethernet-switching vlan members all set interfaces ge-0/0/1 unit 0 family ethernet-switching native-vlan-id 1 The other options are not correct because they do not address the requirement of untagged traffic. VLAN tagging is the process of adding a VLAN identifier to a frame, which is not needed for untagged traffic.
Flexible VLAN tagging is a feature that allows multiple VLAN tags on a single interface, which is not relevant for this scenario. Voice VLAN is a feature that allows voice traffic to be separated from data traffic on a switch port, which is not related to untagged traffic or Wi-Fi access points. References: Understanding Native VLANs on Trunks | Junos OS, Configuring a Native VLAN on a Trunk Port | Junos OS
NEW QUESTION # 28
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: B,D
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 information 1
. This database is used to filter and validate DHCP messages from untrusted sources 1 .
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 attacks 1 . 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 database
1 . The DHCP snooping feature relies on monitoring DHCP messages to build its database 1 , 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 database 1 , and Dynamic ARP inspection (DAI) uses the information stored in the DHCP snooping binding database but does not prevent entries from being created 1 .
NEW QUESTION # 29
Which two statements are correct about the Junos OS "import" policy applied to BGP? (Choose two.)
Answer: B,C
Explanation:
An import policy applied to a BGP peering session filters and/or modifies routes as they are received from that peer, before they are considered for installation into the local routing table.
Import policies are commonly used to set attributes such as local preference on received routes and can match on various conditions, including AS path, community, and prefix-list.
NEW QUESTION # 30
Two routers share the same highest priority and start time.
Answer: B
Explanation:
According to the OSPF protocol, the designated router (DR) is the router that acts as the focal point for exchanging routing information on a multi-access network segment, such as a LAN1. The DR election process is based on the following criteria, in order of precedence1:
The router with the highest OSPF priority becomes the DR. The default priority is 1, and a priority of 0 means the router will not participate in the election.
If there is a tie in priority, the router with the highest router ID becomes the DR. The router ID is a 32-bit number that uniquely identifies a router in an OSPF domain. It can be manually configured or automatically derived from the highest IP address of a loopback interface or a physical interface.
If there is a tie in router ID, the router that was first to become an OSPF neighbor becomes the DR.
In your scenario, two routers share the same highest priority and start time. This means that they have equal chances of becoming the DR based on the first and third criteria. Therefore, the second criterion will be used to break the tie, which is the router ID. The router with the highest router ID will become the DR, and the other router will become the backup designated router (BDR), which is ready to take over the role of DR if it fails1.
NEW QUESTION # 31
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