正解:B
A characteristic of the install all command on the Cisco Nexus series switch is that it automatically checks the image integrity before performing the installation. The install all command is used to install a system image and kickstart image on the switch, as well as to upgrade the BIOS and other firmware components. The install all command performs a series of checks and validations before installing the images, such as verifying the compatibility, checksum, and signature of the images. This ensures that the images are not corrupted or tampered with, and that they match the hardware and software requirements of the switch. The install all command also performs a backup of the current configuration and images, and allows the user to abort the installation process if needed. References :=
* Implementing and Operating Cisco Data Center Core Technologies (DCCOR) v1.2, Module 3: Data Center LAN Network Connectivity, Lesson 3.4: Cisco Nexus 9000 Series Switches
* Cisco Nexus 9000 Series NX-OS System Management Configuration Guide, Release 9.3(x), Chapter:
Installing Software Images and EPLDs, Section: Installing System and Kickstart Images