Exam (elaborations)
NSA Computer Network Test Solved 2024
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NSA Computer Network Test Solved 2024
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NSA Computer Network Test Solved 2024[Linux] What does the *df* command deliver? - ANSWER-The size, used space, and
available space on the machine's mounted file systems
[Linux] What does the *finger* command deliver? - ANSWER-Brief summary of a
particular user, including:
(1) Last time logged in
(2) Home directory
(3) Default shell
[Linux] What does the *free* command deliver? - ANSWER-A summary of memory
usage on the machine
[Linux] What does the *groups* command deliver? - ANSWER-Which groups a
particular user is a part of
[Linux] What does the *kill* command deliver? - ANSWER-The ability to kill a process
by its PID
[Linux] What does the *ps* command deliver? - ANSWER-A snapshot of the current
running processes
[Linux] What does the *top* command deliver? - ANSWER-Real-time display of running
processes and statistics
[Linux] What does the *uname* command deliver? - ANSWER-The ability to obtain
information about the machine, including:
(1) Kernel name (-s)
(2) Kernel release (-r)
(3) Kernel version (-v)
(4) All of the above (-a)
[Linux] What does the *w* command deliver? - ANSWER-The list of currently logged on
users
[Windows] What does the *arp* command deliver? - ANSWER-The functionality of
displaying, adding to, and removing entries from the machine's Address Resolution
Protocol (IP --> MAC) table
[Windows] What does the *getmac* command deliver? - ANSWER-The ability to
retrieve the current machine's MAC address and query remote machine's for their MAC
addresses
[Windows] What does the *nbtstat* command deliver? - ANSWER-Protocol statistics
and current TCP/IP connections using NBT (NetBIOS over TCP/IP)
,[Windows] What does the *route* command deliver? - ANSWER-The ability to query
and configure the machine's routing table.
[Windows] What does the *tasklist* command deliver? - ANSWER-A snapshot of the
current running processes, including the process name, process ID (PID), and memory
usage
[Windows] What does the *tracert* command deliver? - ANSWER-The ability to visually
see a network packet being sent and received and the amount of hops required to
deliver it
[Windows/Linux] What does the *ipconfig/ifconfig* command deliver? - ANSWER-The
ability to configure, control, and query TCP/IP network interface parameters such as
IPv4 and IPv6 addresses, default gateway, subnet mask, etc.
[Windows/Linux] What does the *netstat* command deliver? - ANSWER-Basic statistics
on all of your machine's network activity
- Which ports are listening?
- What addresses and ports are connected to me?
- What addresses and ports am I connected to?
[Windows/Linux] What is the hosts file? - ANSWER-A local file that serves as a local
DNS resolver, mapping IP addresses to hostnames
10.11.12.13 belongs to a class A network. What is this network's network identifier? -
ANSWER-10.0.0.0
10.20.30.40 belongs to a class B network. What is this network's network identifier? -
ANSWER-10.20.0.0
10.9.8.7 belongs to a class C network. What is this network's network identifier? -
ANSWER-10.9.8.0
4 part memory hierarchy - ANSWER-1. Registers
2. Caches
3. Main memory
4. Storage
5 Principles of Ravens Matrices - ANSWER-1. Progression: the shape progresses
through some pattern (rotation, growth, shrinkage, outlining, etc.) as it progresses along
the row and/or column
2. Completion: the shape completes a pattern that holds in each row and/or column, but
not necessarily as a progression (i.e., each column has a triangle of a different size, but
they don't necessarily grow in a progression)
, 3. Addition: the shape is the addition of the shapes in the other two cells of the row
and/or column
4. Commons: the shape is the addition of only the *common* elements of the other two
cells of the row and/or column
5. Uniques: the shape is the addition of only the *unique* elements of the other two cells
of the row and/or column
PCACU
7-step subnetting process - ANSWER-1. Use the subnet mask or CIDR to find the
*network ID*
2. Find the *CIDR* or *subnet mask* (which ever you weren't given)
3. Based on the network ID and subnet mask, determine *how many available hosts
there are*
4. Determine *broadcast address* (network ID + number of available hosts - 1)
5. Determine *first address*
6. Determine *last address*
7. Determine *next network ID*
802.11 belongs to which layer of the TCP/IP model? - ANSWER-The Link layer (layer 1)
802.3 Ethernet belongs to which layer of the TCP/IP model? - ANSWER-The Link layer
(layer 1)
A client makes a DNS request to a server on its LAN. Trace the packet. - ANSWER-1.
Client looks in its local DNS configuration files for the IP address of the DNS server
2. Client determines the DNS server's IP address is in its local network
3. Client encapsulates the DNS request with a layer 3 header with source IP of itself
and destination IP of the DNS server
3. Client checks its ARP table for an entry for the DNS server and doesn't find one
4. Client sends an ARP request to the switch
5. The switch updates its CAM table based on the client's MAC address and switch port
6. The switch broadcasts the client's ARP request on all active switch ports
7. The DNS server receives the ARP broadcast and since the destination IP address is
its own, keeps the request. It updates its ARP table with the IP/MAC of the client and
sends an ARP response to the switch bound for the destination MAC address of the
client
8. The switch updates its CAM table based on the DNS server's MAC address and
switch port
9. The switch forwards the ARP response to the client
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