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You are asked to convert the number 7 from decimal to binary. Which number is correct in this scenario?
A. 00001000
B. 00010000
C. 00000111
D. 11100000
Explanation:
To convert the decimal number 7 to binary, the correct representation is 00000111 (C). In binary, 7 is represented as 1+2+4 (2^0 + 2^1 + 2^2), which corresponds to the last three digits being 1 in the binary format, with leading zeros added for clarity.
Which command displays all IPv6 routes in the default routing instance?
A. showroute table inet.0
B. showroute table inet6.1
C. showroute table inet.1
D. showroute table inet6.0
Explanation:
The show route table inet6.0 command displays all IPv6 routes in the default routing instance. In Junos OS, the routing table for IPv6 addresses is referred to as inet6.0, whereas inet.0 is used for IPv4 unicast routes. The other options do not correspond to the correct IPv6 routing table.
References:
Juniper official documentation: Junos OS Routing Tables Overview.
Which two statements are correct about Junos traceoptions? (Choose two.)
A. Traceoptions cannot be enabled in a production environment.
B. Traceoptions are enabled through configuration.
C. Traceoptions are enabled by default.
D. Traceoption output, by default, is stored in /var/iog/.
Traceoptions in Junos OS are used for detailed debugging and troubleshooting of protocols and processes within the system. They are not enabled by default due to the potential performance impact and volume of data generated. Instead, traceoptions are enabled through specific configuration settings under the relevant protocol or process hierarchy. This allows administrators to target their troubleshooting efforts and control the scope of logging. By default, the output generated by traceoptions is stored in files located in the /var/log directory, with the file name typically specified in the traceoptions configuration. This structured approach to logging and debugging helps in diagnosing complex issues without overwhelming the system or the administrator with irrelevant data.
Which Junos OS component is responsible for maintaining the forwarding table?
A. Routing Engine
B. chassis control daemon
C. Packet Forwarding Engine
D. management daemon
Explanation:
The Packet Forwarding Engine (PFE) in Junos OS is responsible for maintaining the forwarding table. The PFE processes incoming packets, performs route lookups in the forwarding table, and forwards packets based on this information, offloading these tasks from the Routing Engine to ensure efficient packet forwarding.
Which two statements are correct about MAC addresses? (Choose two.)
A. Switches use the Address Resolution Protocol table to assign MAC addresses to network interface cards in the forwarding frame.
B. The source and destination MAC addresses always remains static to the final destination.
C. The MAC address identifies the physical hardware.
D. Switches use the destination MAC address to identify the next-hop destination and to change the destination MAC address in the frame.
Explanation:
MAC (Media Access Control) addresses are unique identifiers assigned to network interfaces for communications at the data link layer of a network segment. MAC addresses are used to identify the physical hardware on a network. In the context of Ethernet switches, the destination MAC address in incoming frames is used to determine the appropriate output port for forwarding the frame towards its final destination. The switch does not change the destination MAC address; it uses the MAC address to make forwarding decisions within the local network segment.
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