CNAB COMPREHENSIVE QUESTIONS AND
ANSWERS SURE A+
✔✔runlevel 4 - ✔✔User-defined mode Not specified by system. Universally defined and
customizable.
✔✔runlevel 5 - ✔✔X11 Default; multi-user, network services and X-windows display
manager (X11).
✔✔runlevel 6 - ✔✔Reboot mode All processes terminated; system is gracefully
rebooted.
✔✔ASCII null - ✔✔0
✔✔ASCII space - ✔✔32
✔✔ASCII 0-9 - ✔✔48-57
✔✔ASCII A-Z - ✔✔65-90
✔✔ASCII a-z - ✔✔97-122
✔✔ASCII del - ✔✔127
✔✔compiled language - ✔✔converts permanently into machine code
✔✔scripting languages - ✔✔convert source code into machine code on the fly
✔✔symbolic link - ✔✔file containing the pathname of another file
✔✔inode - ✔✔contains the metadata for each file and directory
, ✔✔DNS resolver file Windows - ✔✔C:\WINDOWS\system32\DNS
✔✔DNS resolver file Unix - ✔✔/etc/resolv.conf
✔✔layer 7 - ✔✔application
✔✔layer 6 - ✔✔presentation
✔✔layer 5 - ✔✔session
✔✔layer 4 - ✔✔transport (TCP, UDP)
✔✔layer 3 - ✔✔network, router (IP)
✔✔layer 2 - ✔✔data link, (switch, network adapter, bridges, (ethernet, 802.11))
✔✔layer 1 - ✔✔physical (repeater, hubs)
✔✔Network Adapter (NIC) - ✔✔Layer 2: Provides interface between computer and
network medium
✔✔Repeaters - ✔✔Layer 1: Receive and regenerate signal.
✔✔Hubs - ✔✔Layer 1: Multiport repeaters that receive digital signal, regenerate it, and
then broadcast signal to all connected ports
✔✔Switches - ✔✔Layer 2: Send signal to specific port (unlike hubs) based on MAC
addresses
✔✔Routers - ✔✔Layer 3: Interconnect LAN and WAN, based on IP
✔✔Class A - ✔✔0-127, 255.0.0.0, CIDR: 8
✔✔Class B - ✔✔128-191, 255.255.0.0, CIDR: 16
✔✔Class C - ✔✔192-223, 255.255.255.0, CIDR: 32
✔✔Class D - ✔✔224-239 ***Multicast Addressing
✔✔Class E - ✔✔240-255 ***Experimental
✔✔Class A reserved - ✔✔10.0.0.0/8
ANSWERS SURE A+
✔✔runlevel 4 - ✔✔User-defined mode Not specified by system. Universally defined and
customizable.
✔✔runlevel 5 - ✔✔X11 Default; multi-user, network services and X-windows display
manager (X11).
✔✔runlevel 6 - ✔✔Reboot mode All processes terminated; system is gracefully
rebooted.
✔✔ASCII null - ✔✔0
✔✔ASCII space - ✔✔32
✔✔ASCII 0-9 - ✔✔48-57
✔✔ASCII A-Z - ✔✔65-90
✔✔ASCII a-z - ✔✔97-122
✔✔ASCII del - ✔✔127
✔✔compiled language - ✔✔converts permanently into machine code
✔✔scripting languages - ✔✔convert source code into machine code on the fly
✔✔symbolic link - ✔✔file containing the pathname of another file
✔✔inode - ✔✔contains the metadata for each file and directory
, ✔✔DNS resolver file Windows - ✔✔C:\WINDOWS\system32\DNS
✔✔DNS resolver file Unix - ✔✔/etc/resolv.conf
✔✔layer 7 - ✔✔application
✔✔layer 6 - ✔✔presentation
✔✔layer 5 - ✔✔session
✔✔layer 4 - ✔✔transport (TCP, UDP)
✔✔layer 3 - ✔✔network, router (IP)
✔✔layer 2 - ✔✔data link, (switch, network adapter, bridges, (ethernet, 802.11))
✔✔layer 1 - ✔✔physical (repeater, hubs)
✔✔Network Adapter (NIC) - ✔✔Layer 2: Provides interface between computer and
network medium
✔✔Repeaters - ✔✔Layer 1: Receive and regenerate signal.
✔✔Hubs - ✔✔Layer 1: Multiport repeaters that receive digital signal, regenerate it, and
then broadcast signal to all connected ports
✔✔Switches - ✔✔Layer 2: Send signal to specific port (unlike hubs) based on MAC
addresses
✔✔Routers - ✔✔Layer 3: Interconnect LAN and WAN, based on IP
✔✔Class A - ✔✔0-127, 255.0.0.0, CIDR: 8
✔✔Class B - ✔✔128-191, 255.255.0.0, CIDR: 16
✔✔Class C - ✔✔192-223, 255.255.255.0, CIDR: 32
✔✔Class D - ✔✔224-239 ***Multicast Addressing
✔✔Class E - ✔✔240-255 ***Experimental
✔✔Class A reserved - ✔✔10.0.0.0/8
