Correct Answer: ACE

A: The Unbreakable Enterprise Kernel Release 2 is Oracle's second major release of its heavily tested and optimized operating system kernel for Oracle Linux 5 and Oracle Linux 6.

C: Oracle claims that the Unbreakable Enterprise Kernel is compatible with RHEL, and Oracle middleware and third-party RHEL-certified applications can be installed and run unchanged on Unbreakable Enterprise Kernel.

E: Oracle ASMlib is included by default

Incorrect:

Not B: Unbreakable Enterprise Kernel is available for x86-64 servers.

Correct Answer: D

*

strace - trace system calls and signals

In the simplest case strace runs the specified command until it exits. It intercepts and records the system calls which are called by a process and the signals which are received by a process. The name of each system call, its arguments and its return value are printed on standard error or to the file specified with the -o option.

*

strace is a useful diagnostic, instructional, and debugging tool. System administrators, diagnosticians and trouble-shooters will find it invaluable for solving problems with programs for which the source is not readily available since they do not need to be recompiled in order to trace them. Students, hackers and the overly-curious will find that a great deal can be learned about a system and its system calls by tracing even ordinary programs. And programmers will find that since system calls and signals are events that happen

at the user/kernel interface, a close examination of this boundary is very useful for bug isolation, sanity

checking and attempting to capture race conditions.

Each line in the trace contains the system call name, followed by its arguments in parentheses and its

return value. An example from stracing the command ''cat /dev/null'' is:

open("/dev/null", O_RDONLY) = 3

Errors (typically a return value of -1) have the errno symbol and error string appended. open("/foo/bar",

O_RDONLY) = -1 ENOENT (No such file or directory) Signals are printed as a signal symbol and a signal

string. An excerpt from stracing and interrupting the command ''sleep 666'' is:

sigsuspend([]

--- SIGINT (Interrupt) --+++ killed by SIGINT +++

Reference: man strace

Correct Answer: C

The Name Service Switch (NSS) configuration file, /etc/nsswitch.conf, is used by the GNU C Library to determine the sources from which to obtain name-service information in a range of categories, and in what order. Each category of information is identified by a database name. The file is plain ASCII text, with columns separated by spaces or tab characters. The first column specifies the database name. The remaining columns describe the order of sources to query and a limited set of actions that can be performed by lookup result.

Incorrect: Not A: In most Unix-like operating systems and others that implement the BIND Domain Name System (DNS) resolver library, the resolv.conf configuration file contains information that

Not D: /etc/yp.conf - NIS binding configuration file

Reference: nsswitch.conf

Correct Answer: B

The '1' in "/proc/sys/net/ipv4/ip_forward" enables IP forwarding. A '0' signifies IP forwarding is disabled.

Correct Answer: D

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