多项选择题
A. Broadcast domains requiere that the participating devices connect to common swithces or hubs
B. Broadcast domains consist of devices reachable by frames addressed to the Layer 2 broadcast address
C. Broadcast domains requiere a gateway device such a router
D. Broadcast domains consist of devices that reside on the same VLAN
单项选择题 You need to control SSH, HTTP, and Telnet access to an MX240 router through any interface. You have decided to use a firewall filter. How should you apply the firewall filter?（）
单项选择题 Which account is used to access a Junos device in a factory-default configuration?（）
单项选择题 What must be configured prior to the first commit after factory defaults are loaded?（）