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NEW QUESTION # 44
You need to configure interface ge-0/1/2 with an IP address of 172.16.100.1/24. You have accidentally entered 172.16.101.1/24 as shown in the exhibit. Which command should you issue to solve the problem?
Answer: A
Explanation:
In Junos OS, the command rollback 0 is used to revert any uncommitted changes in the candidate configuration, returning the configuration to its state before the uncommitted changes were made. Since the incorrect IP address (172.16.101.1/24) was added but not yet committed, issuing rollback 0 will discard this change, allowing you to re-enter the correct IP address (172.16.100.1/24) without saving the incorrect configuration.
NEW QUESTION # 45
Which statement about collision domains and broadcast domains is correct?
Answer: D
Explanation:
Understanding the distinction between collision and broadcast domains is fundamental to Layer 2 and Layer 3 networking. In a modern Ethernet switching environment, a switch effectively eliminates collisions by creating a separate collision domain for each of its physical ports. This is achieved through micro- segmentation and the support of full-duplex communication, which allows for simultaneous transmission and reception of data on a per-port basis.
However, while a switch segments collision domains, it does not inherently segment broadcast domains. By default, all ports on a switch reside within the same broadcast domain, meaning that a broadcast frame (such as an ARP request) received on one port will be flooded to all other ports within that specific VLAN or bridge domain. Segmenting broadcast domains requires either the configuration of Virtual LANs (VLANs) or the use of a Layer 3 device like a router, which does not forward broadcast traffic by default between its interfaces. It is a common misconception that broadcast domains are absent in IPv6; while IPv6 utilizes multicast (via NDP) instead of traditional Layer 2 broadcasts, the concept of the " link-local " scope where these packets are distributed remains functionally equivalent to a broadcast domain. For the JNCIA-Junos standard, the core takeaway is that switches provide per-port collision isolation while maintaining a unified broadcast environment unless explicitly partitioned. Reference: Networking Fundamentals, Collision and Broadcast Domains.
NEW QUESTION # 46
Which Junos tool should you use to identify the path that packets take through the network to a destination?
Answer: D
Explanation:
The traceroute command shows the path packets take to a destination by displaying each hop along the route.
NEW QUESTION # 47 
Referring to the exhibit, what would be the next-hop address for the packet destined for the 10.0.0.0/24 network if the ge-0/0/1 interface goes down?
Answer: B
Explanation:
Analyzing the provided exhibit of the inet.0 routing table reveals that the destination network 10.0.0.0/24 currently has two viable paths: a static route with a preference of 5 and an OSPF route with a preference of
10. Both routes are configured to use 10.12.0.1 via the ge-0/0/1.0 interface as their primary next hop. The static route is currently marked with an asterisk (*), indicating it is the active path chosen by the Routing Engine due to its lower preference value.
In the event that the ge-0/0/1 interface transitions to a " down " state, the physical layer failure triggers the immediate invalidation of all routes associated with that link. Consequently, both the specific static and OSPF routes for the 10.0.0.0/24 prefix are purged from the active forwarding table. The Routing Engine must then perform a re-evaluation of the routing table to identify the next best match for any traffic destined for that range. Since there are no other more specific or equally specific routes available for the 10.0.0.0/24 network, the router falls back to the default route (0.0.0.0/0) . As shown in the exhibit, the default route points to the next-hop address 10.23.0.3 via interface ge-0/0/2.0 . Therefore, if the primary interface fails, traffic will be redirected through this secondary gateway.
Reference: Routing Fundamentals, Routing Table Selection, Path Redundancy.
NEW QUESTION # 48
What is the purpose of an ARP packet?
Answer: D
Explanation:
The Address Resolution Protocol (ARP) is a fundamental Layer 2 utility used within the IPv4 suite to resolve a known network-layer (Layer 3) address to its corresponding physical media access control (MAC) or hardware address (Layer 2). In a typical Ethernet environment, when a Junos device needs to forward a packet to a next-hop on a local subnet, the Packet Forwarding Engine (PFE) requires the destination MAC address to properly encapsulate the frame.
The process begins with an ARP Request, which is broadcast to all hosts on the segment asking, " Who owns this IP address? " The host assigned that specific IP responds with an ARP Reply containing its MAC address.
The Junos device then stores this mapping in its ARP cache (viewable via the show arp command) to avoid repeated broadcasts for subsequent packets. This resolution is essential because while IP addresses facilitate end-to-end logical routing, the actual delivery of data across a physical wire or switch fabric relies entirely on hardware addresses. Without successful ARP resolution, the device cannot complete the Layer 2 header, and the traffic will be dropped as " encapsulation failed. " Reference: Networking Fundamentals, Ethernet and Address Resolution Protocol.
NEW QUESTION # 49
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