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NEW QUESTION # 74
Which protocol connects multiple autonomous systems?
Answer: C
Explanation:
BGP (Border Gateway Protocol) is the standard exterior gateway protocol used to exchange routing information between different autonomous systems (ASes), enabling communication across the internet backbone.
- iBGP (Internal BGP) is used for routing within a single AS.
- eBGP (External BGP) is used to connect and exchange routing information between multiple autonomous systems.
NEW QUESTION # 75
What are two characteristics of IPv6 addressing? (Choose two.)
Answer: B,C
Explanation:
IPv6 introduces several fundamental shifts in networking architecture compared to its predecessor, IPv4. The most prominent characteristic is the address length; IPv6 utilizes a 128-bit address space, represented in hexadecimal notation across eight groups of 16 bits. This massive expansion from IPv4 ' s 32-bit limit was designed to ensure long-term address availability for the global internet and the growing ecosystem of connected devices.
Another defining characteristic of IPv6 is the concept of address scope, particularly regarding link-local addresses . Any IPv6 address beginning with the fe80::/10 prefix is classified as link-local. These addresses are automatically configured on every IPv6-enabled interface and are strictly not routable beyond the local physical or logical link segment. They are essential for local link operations such as neighbor discovery and routing protocol adjacency formation.
Architecturally, IPv6 also improves performance by streamlining the packet header. Unlike IPv4, the IPv6 header does not include a checksum, as modern link-layer (Layer 2) and transport-layer (Layer 4) protocols perform their own error checking, making a redundant header checksum unnecessary at the network layer.
Additionally, IPv6 replaces the broadcast-based Address Resolution Protocol (ARP) with the multicast-based Neighbor Discovery Protocol (NDP). Understanding these core traits-massive address length and non- routable link-local scoping-is critical for managing modern Junos-based network infrastructures.
Reference: Networking Fundamentals, IPv6 Addressing and Characteristics.
NEW QUESTION # 76
What are two link-state routing protocols? (Choose two.)
Answer: B,D
Explanation:
Link-state routing protocols are a type of routing protocol used in packet-switching networks for finding the best path between source and destination. OSPF (Open Shortest Path First) and IS-IS (Intermediate System to Intermediate System) are both examples of link-state routing protocols.
They work by maintaining a complete map or topology of the network, allowing routers to independently calculate the best path to each destination. Unlike distance-vector protocols like RIP, link-state protocols are more efficient and scalable, making them suitable for larger networks.
NEW QUESTION # 77
You successfully committed a configuration change. You now realize an issue exists and must revert back to the previous configuration. Which command entered in configuration mode will accomplish this task when committed?
Answer: C
Explanation:
Junos OS features a sophisticated configuration management system that automatically creates a snapshot of the active configuration every time a commit is successfully performed. These snapshots are stored as rollback files in a historical archive. Within the configuration mode hierarchy, the rollback command allows an administrator to discard current candidate changes and load a previously committed configuration into the candidate buffer.
The numbering of these rollback files is sequential and follows a specific logic: rollback 0 represents the configuration that is currently active and running on the system. To revert to the state that existed immediately prior to the most recent commit, the administrator must use rollback 1. This command overwrites the current candidate configuration with the previous operational state. It is important to note that executing rollback 1 does not immediately impact the running system; it merely populates the candidate database. The changes must still be verified-often using show | compare-and then finalized by executing the commit command.
By default, Junos maintains up to 50 of these rollback configurations (and up to 100 on certain platforms
/versions), providing a robust safety net for operational recovery and auditing. Reference: Configuration Basics, Managing Configurations, Rollback configurations.
NEW QUESTION # 78
What information would you find using the CLI help command?
Answer: D
Explanation:
The CLI help command in Junos OS provides assistance and explanations for commands, command options, and in some cases, specific system log error messages. By using the help command followed by specific keywords or messages, users can get detailed information and context for the commands they are using or errors they are encountering. This feature is particularly useful for understanding the purpose of commands, their syntax, and troubleshooting error messages that may appear in system logs.
NEW QUESTION # 79
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