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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: BGP | 15-20% | - Neighbor relationships and session establishment - Routing policies, filtering and common troubleshooting - Route advertisement, attributes and path selection |
| Topic 2: Layer 2 Security | 10-15% | - DHCP snooping, Dynamic ARP Inspection and IP Source Guard - Port security, MAC limiting and storm control - Layer 2 firewall filters and security features |
| Topic 3: Layer 2 Switching and VLANs | 15-20% | - Link Aggregation Groups (LAG) and Virtual Chassis - Spanning Tree Protocol (STP, RSTP, MSTP) operation and configuration - VLAN concepts, configuration, trunking and tagging |
| Topic 4: IS-IS | 10-15% | - Configuration and route exchange - Scalable enterprise deployment and troubleshooting - Adjacency establishment, levels and metrics |
| Topic 5: Tunnels and Overlays | 5-10% | - GRE, IP-IP and dynamic tunnel configuration - Tunnel types, encapsulation and operation - Overlay network design and connectivity |
| Topic 6: IP Multicast | 5-10% | - PIM Dense Mode, Sparse Mode and RP mechanisms - Multicast routing monitoring and troubleshooting - IGMP operation and configuration |
| Topic 7: OSPF | 15-20% | - Neighbor formation, area design and LSA types - Route summarization and redistribution - Configuration, verification and troubleshooting |
| Topic 8: Protocol Independent Routing | 10-15% | - Basic routing policy and filter operation - Routing instances and route selection criteria - Routing tables, static routes and route preference |
| Topic 9: High Availability and Resiliency | 5-10% | - Network resiliency design and troubleshooting - Redundancy protocols and failover mechanisms - Graceful restart and non-stop routing |
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NEW QUESTION # 178
What is the purpose of the native VLAN feature on the Juniper Networks EX Series Switches?
Answer: B
Explanation:
A native VLAN is a trunk-port concept, not an access-port concept. On an 802.1Q trunk, every frame is normally expected to carry a VLAN tag identifying its membership; the native VLAN is the single exception that Junos permits an administrator to define using the native-vlan-id statement under the trunk interface's family ethernet-switching hierarchy. Any untagged frame arriving on that trunk port is automatically classified into the configured native VLAN, and conversely, outbound frames belonging to the native VLAN are transmitted untagged rather than with an 802.1Q header. This behavior exists chiefly for interoperability with legacy or third-party devices that either cannot generate 802.1Q tags or intentionally send management or default traffic untagged across an otherwise tagged trunk. Access ports, by definition, only ever carry a single VLAN's traffic and never receive tagged frames in normal operation, so the native VLAN mechanism has no relevance there -- which eliminates the access-port-oriented answer choices.
The native VLAN also does not restrict a trunk to a single VLAN; the trunk continues to carry all configured tagged VLANs simultaneously, with the native VLAN simply being the designated untagged exception. Misconfiguring or mismatching native VLAN IDs between two trunk peers is a classic Layer 2 troubleshooting scenario on the exam.
NEW QUESTION # 179
Which statement about aggregate routes is correct?
Answer: C
Explanation:
Aggregate routes are used for advertising summarized network prefixes. They help minimize the number of routing tables in an IP network by consolidating selected multiple routes into a single route advertisement. This approach is in contrast to non-aggregation routing, in which every routing table contains a unique entry for each route.
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. Aggregate routes are not automatically generated for all of the subnets in a routing table. They need to be manually configured.
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.
NEW QUESTION # 180
Which two statements are correct about VRRP? (Choose two.)
Answer: A,B
Explanation:
The virtual IP address must match on all participating devices - All routers in the same VRRP group must be configured with the same virtual IP address to provide redundancy.
The VRRP group number must match on all participating devices - All routers in the same VRRP group must have the same group number to identify the VRRP group.
NEW QUESTION # 181
You are concerned about spoofed MAC addresses on your LAN. Which two Layer 2 security features should you enable to minimize this concern? (Choose two.)
Answer: C,D
Explanation:
A is correct because dynamic ARP inspection (DAI) is a Layer 2 security feature that prevents ARP spoofing attacks. ARP spoofing is a technique that allows an attacker to send fake ARP messages to associate a spoofed MAC address with a legitimate IP address. This can result in traffic redirection, man-in-the-middle attacks, or denial-of-service attacks. DAI validates ARP packets by checking the source MAC address and IP address against a trusted database, which is usually built by DHCP snooping. DAI discards any ARP packets that do not match the database or have invalid formats. C is correct because DHCP snooping is a Layer 2 security feature that prevents DHCP spoofing attacks. DHCP spoofing is a technique that allows an attacker to act as a rogue DHCP server and offer fake IP addresses and other network parameters to unsuspecting clients. This can result in traffic redirection, man-in-the-middle attacks, or denial-of-service attacks. DHCP snooping filters DHCP messages by classifying switch ports as trusted or untrusted. Trusted ports are allowed to send and receive any DHCP messages, while untrusted ports are allowed to send only DHCP requests and receive only valid DHCP replies from trusted ports. DHCP snooping also builds a database of MAC addresses, IP addresses, lease times, and binding types for each client.
NEW QUESTION # 182
You want to verify prefix information being sent from 10.36.1.4.
Which two statements are correct about the output shown in the exhibit? (Choose two.)
Answer: A,B
Explanation:
The AS path attribute shows AS numbers (e.g., 65401 65520.), indicating the route's traversal through one or various autonomous systems.
The output displays the selected routes and the attributes with which they were received, but does not show the effects of import policy on the routing attributes.
Nothing indicates that the routes have been received from an IBGP peer. The asterisks only indicates whether the routes have been imported into the routing table (RIB) after the application of the import policies.
https://www.juniper.net/documentation/us/en/software/junos/cli-reference/topics/ref/command/show-route-receive-protocol.html
NEW QUESTION # 183
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