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NEW QUESTION # 60
Which protocol is used to discover the Layer 2 (MAC) address of a next hop for IPv6 hosts?
Answer: B
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 # 61
Which two statements about prefix lists in Junos are correct? (Choose two.)
Answer: A,C
Explanation:
Prefix lists in Junos OS are named collections of IP addresses or network prefixes defined under the [edit policy-options] hierarchy. One of their most powerful features is their versatility and reusability. Because they are defined as independent objects, a single prefix list can be referenced in multiple different routing policies across the device. This modularity ensures consistency; for instance, if a set of " internal " prefixes changes, an administrator only needs to update the list in one location for those changes to propagate to every policy that utilizes it.
Furthermore, prefix lists are designed to be used across different functional areas of the Junos architecture.
They are equally valid for use in routing policies (to control the import or export of routes between protocols like BGP or OSPF) and in firewall filters (to match source or destination addresses for transit or management traffic). When used in a routing policy, the prefix list typically performs an exact match on the prefix length unless modified by a match type like orlonger. In a firewall filter, it acts as a high-speed lookup table for the Packet Forwarding Engine. This dual-purpose capability makes prefix lists a foundational tool for architects seeking to implement scalable, automated security and routing logic within a unified configuration framework.
NEW QUESTION # 62
Which Junos OS component is responsible for maintaining the forwarding table?
Answer: B
Explanation:
The Routing Engine (RE) is responsible for maintaining the routing table and the forwarding table.
It runs the routing protocols, computes the best paths, and updates the routing table accordingly.
The routing table information is then used to populate the forwarding table, which is provided to the Packet Forwarding Engine (PFE) to make packet-forwarding decisions.
NEW QUESTION # 63
You asked a network engineer to configure a new logical interface on a Juniper router. The interface must use the fourth usable host address from the 172.16.40.128/29 subnet. Which IP address is correct in this scenario?
Answer: B
Explanation:
In the Junos OS environment, precise IP addressing and subnet calculation are foundational for interface configuration. A /29 subnet mask (255.255.255.248) provides a total of 8 IP addresses. To identify the usable host range, we must first identify the network and broadcast addresses. For the subnet 172.16.40.128/29, the network address is 172.16.40.128. The broadcast address is the last address in the block, which is
172.16.40.135.
Following standard IPv4 conventions, the first and last addresses in a block are reserved for the network identity and the directed broadcast, respectively. This leaves 6 usable host addresses: 172.16.40.129 through
172.16.40.134. Counting sequentially from the beginning of the usable range: the first usable host is .129, the second is .130, the third is .131, and the fourth usable host is 172.16.40.132. Assigning this specific address ensures that the Packet Forwarding Engine can correctly route traffic within the intended segment. As a Senior Architect, it is critical to verify these boundaries when using the set interfaces unit 0 family inet address command to prevent address overlapping or the accidental assignment of reserved network/broadcast IDs.
Reference: Networking Fundamentals, IPv4 Addressing, CIDR Subnetting.
NEW QUESTION # 64
Which two components are included in a transport header? (Choose two.)
Answer: B,C
Explanation:
The transport layer in the OSI model is responsible for end-to-end communication and error recovery. In a transport header, such as TCP or UDP, the key components include the source port number and the destination port number. These port numbers are used to identify sending and receiving applications. The source port number indicates the port of the sending application, and the destination port number refers to the port of the receiving application. MAC addresses, on the other hand, are part of the data link layer (Layer 2) and would be included in an Ethernet header, not a transport header.
NEW QUESTION # 65
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