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| Section | Weight | Objectives |
|---|---|---|
| Layer 2 Security | 10-15% | - Layer 2 firewall filters and security features - DHCP snooping, Dynamic ARP Inspection and IP Source Guard - Port security, MAC limiting and storm control |
| Protocol Independent Routing | 10-15% | - Routing tables, static routes and route preference - Basic routing policy and filter operation - Routing instances and route selection criteria |
| Layer 2 Switching and VLANs | 15-20% | - VLAN concepts, configuration, trunking and tagging - Link Aggregation Groups (LAG) and Virtual Chassis - Spanning Tree Protocol (STP, RSTP, MSTP) operation and configuration |
| IS-IS | 10-15% | - Scalable enterprise deployment and troubleshooting - Adjacency establishment, levels and metrics - Configuration and route exchange |
| OSPF | 15-20% | - Configuration, verification and troubleshooting - Route summarization and redistribution - Neighbor formation, area design and LSA types |
| Tunnels and Overlays | 5-10% | - Overlay network design and connectivity - Tunnel types, encapsulation and operation - GRE, IP-IP and dynamic tunnel configuration |
| BGP | 15-20% | - Neighbor relationships and session establishment - Routing policies, filtering and common troubleshooting - Route advertisement, attributes and path selection |
| High Availability and Resiliency | 5-10% | - Graceful restart and non-stop routing - Network resiliency design and troubleshooting - Redundancy protocols and failover mechanisms |
| IP Multicast | 5-10% | - PIM Dense Mode, Sparse Mode and RP mechanisms - IGMP operation and configuration - Multicast routing monitoring and troubleshooting |
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NEW QUESTION # 190
Which two elements are used to create the STP bridge ID? (Choose two.)
Answer: C,D
NEW QUESTION # 191
Referring to the exhibit, all users connected to the same VLAN can communicate with each other, but not with users on other VLANs in this network.
What must be configured to enable communication between the VLANs?
Answer: A
NEW QUESTION # 192
You need to block SSH (TCP port 22) traffic from the 192.168.10.0/24 network.
Which firewall filter term is correct in this scenario?
Answer: A
Explanation:
Correctly blocking SSH traffic originating from a specific network requires matching three precise conditions simultaneously in the from clause: the traffic's source-address must equal the 192.168.10.0/24 network, since the requirement is to block traffic coming from that network rather than traffic destined to it; the protocol must be explicitly set to tcp, since SSH operates exclusively over TCP; and the destination-port must be set to
22, because an inbound SSH connection request is always directed at the well-known SSH listening port 22 on the receiving side, regardless of which ephemeral source port the initiating client happens to use. The first option satisfies all three conditions correctly and pairs them with a discard action, cleanly dropping matching traffic. The second option incorrectly substitutes destination-address for source-address, which would match traffic heading toward that /24 rather than traffic originating from it, inverting the intended match direction.
The third option incorrectly uses source-port 22 instead of destination-port 22; since the SSH client's source port is a randomly assigned ephemeral value rather than a fixed 22, this term would almost never match real SSH session-initiation traffic. The fourth option relies on a service ssh match condition, which is not valid syntax within the standard Junos firewall filter grammar for family inet; there is no such application-based keyword available at that hierarchy, making the term invalid regardless of the reject action chosen. Reference topics: Junos Enterprise Switching - Firewall Filters, Matching on Address, Protocol, and Port Conditions.
NEW QUESTION # 193
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: A,B
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 # 194
You are asked to deploy nonstop active routing (NSR) on a dual-Routing Engine platform. In this scenario, what are two additional requirements for proper operation? (Choose two.)
Answer: B,D
Explanation:
Nonstop active routing is specifically engineered to be completely transparent to the rest of the network:
rather than relying on neighboring routers to preserve state during a Routing Engine switchover the way graceful restart does, NSR keeps a fully synchronized instance of the routing protocol process (rpd) running continuously on the backup Routing Engine, mirroring protocol adjacencies, the RIB, and session state in real time. Because neighbors never observe a session reset or restart signal during an NSR-driven switchover, there is no dependency on those neighbors supporting or enabling graceful restart extensions at all - this is the core architectural advantage that distinguishes NSR from GR and is precisely why the first and third answer choices are incorrect distractors. What NSR does require locally is Graceful Routing Engine Switchover (GRES) enabled first, since NSR is built as an extension on top of GRES and depends on it to synchronize kernel and interface state between the two Routing Engines before protocol-level synchronization can occur. Additionally, Juniper's official guidance mandates that both Routing Engines run the identical Junos OS software version; mismatched versions between the primary and backup Routing Engine can introduce incompatible internal data structures or feature behavior during state replication, jeopardizing the integrity of a switchover and is explicitly called out as a hard operational requirement rather than a mere best practice. Reference topics: Junos Enterprise Routing - High Availability, Nonstop Active Routing Requirements and GRES Dependency.
NEW QUESTION # 195
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