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NEW QUESTION # 37
Which command displays the currently active configuration on a Junos device?
Answer: A
Explanation:
The show configuration command, when issued in operational mode, displays the active (committed) configuration currently running on the device.
NEW QUESTION # 38
Exhibit:
Referring to the exhibit, which route will be selected for a packet destined to IP address 10.50.10.55?
Answer: B
Explanation:
In Junos OS, the Routing Information Base (RIB) selection process follows a strict hierarchy where the Longest Prefix Match (LPM) is the absolute primary tie-breaker. When a packet is destined for 10.50.10.55
, the Routing Engine searches the inet.0 table for all matching entries. In this exhibit, four routes match: the default route ( 0.0.0.0/0 ), a general static route ( 10.0.0.0/8 ), an OSPF route ( 10.50.0.0/16 ), and a BGP route ( 10.50.10.0/24 ).
The LPM rule dictates that the router must select the most specific route available, which is defined as the entry with the highest number of matching bits in the subnet mask. The 10.50.10.0/24 route matches 24 bits of the destination address, making it more specific than the 16-bit, 8-bit, or 0-bit alternatives. It is critical to understand that route preference (e.g., Static at 5, OSPF at 10, or BGP at 170) is only evaluated if there are multiple paths to the exact same prefix and length. Because these prefixes vary in length, the length takes precedence over the protocol preference. Therefore, the BGP-learned route via 192.168.1.20 is selected as the active path, ensuring traffic follows the most granular routing information provided to the device. Reference:
Routing Fundamentals, Routing Table Selection, Longest Prefix Match.
NEW QUESTION # 39
Which interface type prefix represents a 10-Gigabit Ethernet interface?
Answer: D
Explanation:
The xe interface prefix is used in Junos OS to represent 10-Gigabit Ethernet interfaces.
NEW QUESTION # 40
Which two statements about firewall filters are correct? (Choose two.)
Answer: A,D
Explanation:
In Junos OS, standard firewall filters operate as a primary security and traffic management tool within the forwarding plane. These filters are fundamentally stateless, meaning they evaluate each packet individually and in isolation without maintaining a session table or tracking the state of network connections. This stateless nature allows the Packet Forwarding Engine (PFE) to process filters at hardware speeds, ensuring minimal latency for transit traffic. This distinguishes them from the stateful security policies found on Junos security devices like the SRX Series, which track the entire lifecycle of a flow.
Furthermore, firewall filters are designed to inspect and match header information up to Layer 4 of the OSI model. This capability allows administrators to define terms based on parameters such as source and destination IP addresses (Layer 3) as well as TCP or UDP port numbers and protocol types (Layer 4). While they provide granular control over packet flow, they do not natively inspect Layer 7 application payloads, which is typically reserved for advanced services like Intrusion Detection and Prevention (IDP). By combining stateless execution with Layer 4 matching, Junos firewall filters provide an efficient method for implementing transit protection, rate limiting through policing, and protecting the local Routing Engine through loopback interface filtering. Reference: Routing Policy and Firewall Filters, Firewall Filter Framework.
NEW QUESTION # 41
How many usable hosts are in a /24 subnet mask?
Answer: B
Explanation:
In the IPv4 addressing architecture, a /24 prefix length (standard Class C subnet mask of 255.255.255.0) signifies that the first 24 bits of the 32-bit address are reserved for the network portion, leaving 8 bits for the host portion. To calculate the total number of available IP addresses within this range, the formula $2