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| Section | Objectives |
|---|---|
| Topic 1: Spanning Tree Protocol | - Root bridge, port roles and states - STP, RSTP, MSTP concepts and operation - Configuration, monitoring and troubleshooting |
| Topic 2: Protocol Independent Routing | - Routing tables, routing preferences - Routing policy and firewall filters - Static routes, aggregate routes - Configuration, monitoring and troubleshooting |
| Topic 3: Layer 2 Switching and VLANs | - VLAN concepts, tagging, ports, native VLAN - Inter-VLAN routing - Layer 2 switching concepts and operation - Configuration, monitoring and troubleshooting |
| Topic 4: High Availability | - Virtual Chassis, redundant routing engines - Graceful restart, nonstop active routing - Configuration, monitoring and troubleshooting |
| Topic 5: Layer 2 Security | - Dynamic ARP inspection, DHCP snooping - Port security, storm control, MAC limiting - Layer 2 firewall filters - Configuration, monitoring and troubleshooting |
| Topic 6: OSPF | - OSPFv2/v3 concepts, areas, LSA types - Neighbor relationships, route calculation - Configuration, monitoring and troubleshooting |
| Topic 7: BGP | - BGP concepts, attributes, path selection - IBGP, EBGP, route policies - Configuration, monitoring and troubleshooting |
| Topic 8: IS-IS | - IS-IS concepts, levels, routing information - Configuration, monitoring and troubleshooting |
| Topic 9: Tunnels | - IP-IP, GRE, IPsec tunnels - Configuration, monitoring and troubleshooting |
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NEW QUESTION # 184
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 # 185
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 # 186
Which statement about aggregate routes is correct?
Answer: A
Explanation:
Aggregate routes are used for advertising summarized network prefixes 1 2 . They help minimize the number of routing tables in an IP network by consolidating selected multiple routes into a single route advertisement 1
. This approach is in contrast to non-aggregation routing, in which every routing table contains a unique entry for each route 1 .
Therefore, option D is correct. Options A, B, and C are not correct because:
* Aggregate routes can be used with both static routing and dynamic routing protocols 1 .
* Aggregate routes are not automatically generated for all of the subnets in a routing table. They need to be manually configured 1 .
* Aggregate routes are not always preferred over more specific routes. The route selection process in Junos OS considers several factors, including route preference and metric, before determining the active route 1 .
NEW QUESTION # 187
Which statement is correct about the storm control feature?
Answer: D
Explanation:
The storm control feature is enabled in the factory-default configuration on EX Series switches.
On EX2200, EX3200, EX3300, EX4200, and EX6200 switches, the factory default configuration enables storm control for broadcast and unknown unicast traffic on all switch interfaces. On EX4300 switches, the factory default configuration enables storm control on all Layer 2 switch interfaces.
NEW QUESTION # 188
Which two statements about redundant trunk groups on EX Series switches are correct? (Choose two.)
Answer: A,D
Explanation:
Explanation
Redundant Trunk Groups (RTGs) on EX Series switches provide a simple solution for network recovery when a trunk port on a switch goes down1. They are configured on the access switch and contain two links: a primary or active link, and a secondary link1. Therefore, option B is correct because if the active link fails, the secondary link automatically starts forwarding data traffic without waiting for normal spanning-tree protocol convergence1.
Option D is also correct. In a typical enterprise network composed of distribution and access layers, RTGs are used where one Access switch is connected to two different uplink switches2. This implies that RTGs must be connected to the same aggregation switch2.
NEW QUESTION # 189
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