In Linux and Unix systems, what directory is most likely to contain system configuration data?

In Linux and Unix systems, what directory is most likely to contain system configuration data?

• /boot/
• ~/.config
• /usr/share/doc
• /etc/ 

 

EXPLANATION

As a rule, system configuration data should be kept in /etc/ http://tldp.org/LDP/Linux-Filesystem-Hierarchy/Linux-Filesystem-Hierarchy.pdf This can be quite useful knowledge when figuring out backup and recovery plans!

 

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You setup your server to accept PPTP VPN client connections. You accurately port forward TCP 1723 on the firewall to the server, but clients still cannot connect. Of the below options, what would be the most likely reason?

You setup your server to accept PPTP VPN client connections. You accurately port forward TCP 1723 on the firewall to the server, but clients still cannot connect. Of the below options, what would be the most likely reason?

• GRE not enabled or blocked on the firewall.
• Port forward of UDP 1723 missing.
• No static routes configured on the firewall.
• Port forward of UDP 500 missing.

EXPLANATION

GRE is an encapsulation protocol required by some PPTP VPN connections, notably Microsoft's implementation. Some cheaper and consumer level firewall/routers do not support or have an option for GRE, or if it does it might be disabled or blocked.
UDP 500 is specific to IPSEC.
Along with the citation, also see...
http://whp-aus1.cold.extweb.hp.com/pub/networking/software/ProCurve-SR-dl-GRE-Config-Guide.pdfhttp://www.cisco.com/c/en/us/support/docs/ip/generic-routing-encapsulation-gre/118361-technote-gre-0....
https://en.wikipedia.org/wiki/Generic_Routing_Encapsulation

SOURCE

https://blogs.technet.microsoft.com/rrasblog/2009/08/12/troubleshooting-common-vpn-related-errors/

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Convert 101101 from binary to decimal!

Convert 101101 from binary to decimal!

• 44
• 61
• 45
• 41 

EXPLANATION

Each 1 represents a power of 2, so this is equivalent to 2^5 + 2^3 + 2^2 + 2^0, or 32 + 8 + 4 + 1 = 45.

Reference material: https://en.wikipedia.org/wiki/Binary_number#Conversion_to_and_from_other_numeral_systems

Also, http://www.wikihow.com/Convert-from-Decimal-to-Binary

also http://www.funtrivia.com/askft/Question124874.html

1 x 1 = 1
0 x 2 = 0
1 x 4 = 4
1 x 8 = 8
0 x 16 = 0
1 x 32 = 32

1 + 4 + 8 + 32 = 45

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What's a stealthy and continuous computer hacking process often targeted at a specific entity?

What's a stealthy and continuous computer hacking process often targeted at a specific entity?

• Shadow ninja attack
• Advanced persistent threat
• Advanced malware attack
• Silent and deadly attack 

 

EXPLANATION

An advanced persistent threat (APT) uses multiple phases to break into a network, avoid detection, and harvest valuable information over the long term. The intention of an APT attack is to steal data rather than to cause damage to the network or organization. APTs require a high degree of covertness over an extended period of time.

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Which of these cloud distribution models delivers a licensed application to customers over the Internet as an on-demand service?

Which of these cloud distribution models delivers a licensed application to customers over the Internet as an on-demand service?

• Platform as a service
• Infrastructure as a service
• Security as a service
• Software as a service 

EXPLANATION

Software as a service, or "software on demand," is a software licensing and delivery model where a vendor hosts an application and allows you to download it for a set period of time.
This can be handy if your business wants access to a particular application without the upfront costs of purchasing a full license or dealing with maintenance.

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