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NEW QUESTION # 81
Which two operational mode commands would you use to verify CPU and memory utilization on a Junos device? (Choose two.)
Answer: C,D
Explanation:
In the Junos OS architecture, maintaining visibility into the health of the Routing Engine (RE) is paramount for ensuring control plane stability. The command show chassis routing-engine is the primary tool for a high- level hardware status overview. It provides critical telemetry regarding the RE ' s current CPU utilization (broken down by user, background, and kernel tasks), memory usage statistics, and uptime. This command is essential for identifying if the device ' s " brain " is under significant stress due to heavy protocol processing or management tasks.
For a more granular, process-specific analysis, the show system processes extensive command is utilized.
Similar to the ' top ' utility in Unix-based systems, it lists all active software daemons (such as rpd for routing, dcd for interfaces, and mgd for management) and ranks them by their real-time CPU and memory consumption. This allows an architect to pinpoint exactly which process might be causing a performance bottleneck. While show chassis environment focuses on physical hardware health like temperatures and fan speeds, and resource-monitor provides summary data, the combination of show chassis routing-engine and show system processes extensive offers the most comprehensive diagnostic view of the device ' s internal computational resources. Reference: Operational Monitoring and Maintenance, System Health Monitoring.
NEW QUESTION # 82
Which component is considered part of the data plane?
Answer: A
Explanation:
The Packet Forwarding Engine (PFE) is an integral component of Juniper Networks devices, responsible for the data plane operations. The data plane, also known as the forwarding plane, is where the actual processing and forwarding of packets occur based on the routing and forwarding tables. The PFE executes the forwarding decisions made by the Routing Engine (RE), handling all packet transmissions, including routing, filtering, and switching packets towards their destination. This contrasts with the control plane operations handled by the RE, which involve routing table maintenance, system management, and control protocol processing.
NEW QUESTION # 83
Which two characteristics apply to TCP? (Choose two.)
Answer: B,D
Explanation:
Comprehensive and Detailed 150 to 250 words of Explanation From: The Transmission Control Protocol (TCP) is a core transport-layer protocol within the TCP/IP suite designed to provide a highly reliable, connection-oriented service. Unlike the User Datagram Protocol (UDP), which is connectionless and best- effort, TCP ensures that data is delivered accurately and in the correct order. A defining characteristic of TCP is its use of a three-way handshake to establish a session. This process involves the exchange of SYN, SYN- ACK, and ACK segments, which synchronizes sequence numbers between the two endpoints and ensures both hosts are ready for data transfer.
Furthermore, TCP provides reliable, ordered delivery by utilizing sequence numbers and acknowledgments. Each data segment is assigned a sequence number; the receiving host uses these numbers to reassemble the data in its original order, even if segments arrive out of sequence due to network jitter or multiple paths. If a segment is lost, the lack of a timely acknowledgment triggers a retransmission, guaranteeing that the application receives all data. TCP does not provide fixed latency guarantees, as its error- recovery mechanisms can introduce delays. Additionally, TCP is a unicast-only protocol and does not support broadcasting on Ethernet. Reference: Networking Fundamentals, Transport Layer Protocols, TCP vs.
UDP.
NEW QUESTION # 84
Which protocol is used to discover the Layer 2 (MAC) address of a next hop for IPv6 hosts?
Answer: D
Explanation:
In the IPv6 protocol suite, the traditional Address Resolution Protocol (ARP) used in IPv4 has been deprecated and replaced by the Neighbor Discovery Protocol (NDP). NDP is a multifaceted protocol built upon the Internet Control Message Protocol version 6 (ICMPv6). Its primary purpose is to allow a host or router to determine the Layer 2 hardware (MAC) address of a neighbor on the same local link when only the neighbor's IPv6 address is known.
This specific process is known as Neighbor Solicitation and Neighbor Advertisement. When a Junos device needs to resolve a MAC address for an IPv6 next hop, it sends a Neighbor Solicitation (ICMPv6 Type 135) message to the solicited-node multicast address. The target host responds with a Neighbor Advertisement (ICMPv6 Type 136) containing its physical MAC address. Beyond address resolution, NDP also handles Router Discovery, Prefix Discovery, and Duplicate Address Detection (DAD). Unlike ARP, which relies on broadcasts that can impact all hosts on a segment, NDP utilizes efficient multicast communication. Understanding NDP is critical for Junos architects, as it is the foundational mechanism that facilitates logical-to-physical address mapping in modern IPv6 environments, ensuring that the Packet Forwarding Engine can properly encapsulate frames for local delivery.
NEW QUESTION # 85
When considering routing policies, which two statements are correct? (Choose two.)
Answer: A,B
Explanation:
Routing policies in Junos OS are crucial for controlling route advertisements and path selection.
The correct answers are B and C. An import routing policy for BGP determines which received prefix advertisements are placed in the routing information base (RIB), and policy terms are evaluated from top to bottom, with action taken on the first match found. This sequential evaluation allows for precise control over routing decisions.
NEW QUESTION # 86
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