Friday, February 23, 2018
Thursday, February 22, 2018
In the early days of computer technology, what type of memory had to be hand made rather than by machine?
In the early days of computer technology, what type of memory had to be hand made rather than by machine?
- Thin film memory
- EPROM
- Magnetic core memory
- Bubble Memory
EXPLANATION
Magnetic core memory was almost always "woven" by hand in spite of repeated attempts to automate the process. Core uses tiny magnetic beads (the cores), through which wires are threaded to write and read information.SOURCE
https://en.wikipedia.org/wiki/Magnetic-core_memoryWednesday, February 21, 2018
Which is the standard file extension used by VMWare for virtual hard drive images?
Which is the standard file extension used by VMWare for virtual hard drive images?
- VHD (Virtual Hard Disk)
- VDI (Virtual Disk Image)
- VMDK (Virtual Machine Disk)
- HDD (Hard Disk Drive)
EXPLANATION
VMDK is the standard used by VMWare and is supported by several other virtual hypervisors. It can contain the entire virtual machine, including settings.VHD is the standard typically used by Microsoft Hyper-V. It represents a single virtual drive, and does not contain configuration settings for the rest of the virtual machine.
HDD is the standard for Parallels.
VDI is the standard and default for type-2 hypervisor VirtualBox; it can use and create all four of the listed formats, however.
Tuesday, February 20, 2018
What is the minimum size of the IPv6 packet header?
What is the minimum size of the IPv6 packet header?
- 36 octets
- 32 octets
- 40 octets
- 48 octets
EXPLANATION
The IPv6 packet header has a minimum size of 40 octets. Options are implemented as extensions. This provides the opportunity to extend the protocol in the future without affecting the core packet structure.RFC 2460; Internet Protocol, Version 6 (IPv6) Specification, S. Deering, R. Hinden (December 1998)
https://en.wikipedia.org/wiki/IPv6
Monday, February 19, 2018
In MacOS, what terminal command will temporarily reduce the frequency of the "spinning beach ball" icon caused by a RAM shortage?
In MacOS, what terminal command will temporarily reduce the frequency of the "spinning beach ball" icon caused by a RAM shortage?
- purge ram
- purge mem
- sudo purge
- sudo clearmem
EXPLANATION
Purging the memory clears on inactive memory allocation, thus making it usable to applications. Sudo purge accomplishes this.SOURCE
http://osxdaily.com/2012/04/24/free-up-inactive-memory-in-mac-os-x-with-purge-command/Friday, February 16, 2018
Which of the following is NOT a PowerShell comparison operator type?
Which of the following is NOT a PowerShell comparison operator type?
- Matching
- Containment
- Replacement
- Assignment