Linux consists of the user space and kernel space. Which of the following functions are included in the kernel space? (Select All that Apply)

In Linux, the operating system is divided into user space (where applications run) and kernel space

(where the OS core functions execute with privileged access to hardware). Let’s evaluate each

function:

A. The NIC Driver Sends Data Frames: Network Interface Card (NIC) drivers operate in kernel space,

managing hardware interactions like sending and receiving data frames. This is a low-level task

requiring direct hardware access, handled by the kernel’s network stack. Included in Kernel Space.

B. Data Encapsulation: Data encapsulation (e.g., adding headers in the TCP/IP stack) occurs in the

kernel’s network subsystem (e.g., via the protocol stack like IP or TCP). This process prepares packets

for transmission and is a kernel-space function. Included in Kernel Space.

C. Bit Stream Transmission: This refers to the physical transmission of bits over the network,

managed by the NIC hardware and its driver in kernel space. The kernel coordinates with the NIC to

send bit streams, making this a kernel-space function. Included in Kernel Space.

D. Data Encryption: Encryption (e.g., via OpenSSL or application-level VPNs) typically occurs in user

space, where applications or libraries handle cryptographic operations. While the kernel supports

encryption (e.g., IPsec in the network stack), the actual encryption logic is often offloaded to user-

space tools, not a core kernel function in standard contexts. Not Typically in Kernel Space.

Thus, A, B, and C are functions included in the kernel space, aligning with Linux architecture in

Huawei’s DCN context.

Reference: Huawei HCIP-Data Center Network Training – Linux Basics; Linux Kernel Documentation –

Kernel vs. User Space.