JNCIA-Junos: Juniper Networks Certified Associate – Junos (legacy) — Question 1

Which of the following commands will configure the maximum transmission unit size of a fast Ethernet interface?

Answer options

• A. set interfaces fe-0/0/0 unit 0 ethernet-options mtu 1200
• B. set interfaces fe-0/0/0 mtu 1200
• C. set interfaces fe-0/0/0 unit 0 mtu 1200
• D. set interfaces fe-0/0/0.0 mtu 1200

Correct answer: C

Explanation

The correct command, C, specifically targets the MTU for the fast Ethernet interface by including 'unit 0', which is necessary for precise configurations. Options A and D are incorrect as they either use a wrong syntax for MTU configuration or do not correctly reference the unit. Option B lacks the 'unit 0' specification, making it less accurate for configuring the MTU on a fast Ethernet interface.