When it comes to email, what is Postfix?
- A mail user agent
- Paid software
- A mail submission agent
- A mail transfer agent
When it comes to email, what is Postfix?
Thursday, November 23, 2017
Grandfather-Father-Son (GFS) is a(n):
Grandfather-Father-Son (GFS) is a(n):
- Hierarchical UML design pattern
- Common backup media rotation strategy
- Inheritance design standard in object-oriented programming
- Layered SDN (software defined networking) design standard
EXPLANATION
Grandfather-Father-Son is a common backup media rotation strategy. It employs a daily-weekly-monthly approach that addresses near-term and long-term (archival) backup concerns.https://www.sans.org/reading-room/whitepapers/sysadmin/backup-rotations-final-defense-305
If you’re looking to display all files in a given directory and all its sub-directories, including hidden files, which of the following Linux command would you use?
If you’re looking to display all files in a given directory and all its sub-directories, including hidden files, which of the following Linux command would you use?
- ls -aR
- ls -l
- ls-a
- ls -R
EXPLANATION
The Bash command "ls" lists all information about a given file. In this case, it’s modified by "-aR" to maintain groups of files as a single archive file, which displays everything in a given file. By itself, this command will show you everything on your hard disk (and we mean everything).SOURCE
http://linuxcommand.org/lc3_man_pages/ls1.htmlWhich of the following is an IPV6 automatic tunneling protocol used by Windows on systems located behind a NAT router?
Which of the following is an IPV6 automatic tunneling protocol used by Windows on systems located behind a NAT router?
- APIPA
- ISATAP
- 6to4
- Teredo
EXPLANATION
Teredo is a mechanism that enables devices behind non-IPv6 NAT routers to function as tunnel endpoints.For more information on Teredo, see: https://en.wikipedia.org/wiki/Teredo_tunneling
Which of the following is FALSE about DDR2 and DDR3 RAM?
Which of the following is FALSE about DDR2 and DDR3 RAM?
- DDR3 uses less power than DDR2
- DDR3 has fewer pins than DDR2
- DDR3 is not backwards compatible with DDR2
- DDR3 is faster than DDR2
EXPLANATION
DDR3 is the successor to DDR2 memory technology. There are several differences between them. DDR3 is not backwards compatible with DDR2. While both types of modules have the same numbers of pins, the notches in the PCB are in different locations. In other words, a DDR3 module cannot be placed in a DDR2 memory socket, and vice-versa.DDR3 modules run on 1.5V compared to the 1.8V that DDR2 modules require. The DDR3 decrease in voltage results in less power consumption and greater energy-efficiency at comparable speeds.
DDR3 is faster. DDR2 "JEDEC standard" memory typically stops at around 800MHz whereas the introductory speeds of DDR3 when it was released in 2007 started at 800MHz and is far faster than that now.
