Basic network commands

Used to display the current route tables on a host, can be used to add or remove routes, used by the local host to determine where to send traffic

Route

Leverages SSH (Secure shell) for authentication and encryption and used to securely copy files between servers

SCP

Which network protocol provides a secure way to access a remote computer over an unsecured network? a) HTTP b) TCP c) SSH d) UDP

SSH

Which protocol provides remote access over encrypted connections? 1) FTP 2) SSH 3) DNS 4) ICMP

SSH

Displays packets that are being transmitted over the network system, is a form of protocol analyzer, and shows the contents of network packets in human-readable form

TCPDUMP

Allows a user to manage accounts and devices remotely, Can be encrypted to secure data from eavesdropping, and Can be encrypted, as well

TELNET/SSH

Transfers a file from either a client to a server or from a server to a client, uses UDP instead of TCP, typically used on reliable (local) networks

TFTP

Displays the path taken by a packet from its source to its destination, can be used by any user, regardless of privileges, and primarily used in windows

TRACEPATH

If I want to measure latency between more than two devices, what network command do I use?

TRACEROUTE/TRACERT

Used to trace the route an IP packet takes to a destination, displays each hop's IP address and the time it takes to receive the packet, used for Linux and Windows systems, and useful in troubleshooting performance and connectivity issues.

TRACEROUTE/TRACERT

What protocol is used for sending short messages, called datagrams, and is less reliable than TCP? a) TCP b) UDP c) SNMP d) DNS

UDP

Most often used to look up who owns a domain or block of IP addresses on the Internet, returns information including name, email, address, and physical address, privacy options may hide this information from being returned, primarily used in Linux

WHOIS

Which command is used to display and modify entries in the ARP cache? a) arp b) ping c) nslookup d) ssh

arp

What does the address resolution protocol (ARP) cache map? 1) IP address to network destinations 2) I) address to MAC addresses 3) MAC addresses to interfaces 4) MAC addresses to ICMP

2

Which command should be run in Linux to ping an IP address 192.168.0.15 eight times before it automatically terminates the process? 1) Ping -w 192.168.0.15 2) Ping -s 192.168.0.15 3) Ping -i 192.168.0.15 4) Ping -c 192.168.0.15

4

Displays the IP to physical (MAC) address mappings for hosts that have been discovered. Used to add, remove, or modify entries in the cache, and discovers addresses by broadcasting to the network and noting the reply from the owner

ARP (Address resolution protocol)

What protocol is used to automatically assign IP addresses and other network configuration information to devices on a network? a) DHCP b) SNMP c) SMTP d) HTTP

DHCP

Used to retrieve the entire DNS response message used for lookups and display answers from the query uses the OS resolver libraries, and native to Linux

DIG

Which protocol is used to obtain domain name or IP address mapping information by querying DNS servers? a) FTP b) SSH c) DNS d) SNMP

DNS

Displays information about a user or users on a remote system, includes information such as last login time and username, and primarily used in Linux

FINGER

Copies the files from one host to another host, the data is unencrypted unless a secure sockets layer is used, and transfer uses TCP used on the internet and other wide-area networks

FTP

What protocol is used for transferring files between a client and a server on a computer network? a) POP3 b) SMTP c) HTTP d) FTP

FTP

Which protocol is used for transferring hypertext documents on the World Wide Web? a) FTP b) SSH c) HTTP d) SNMP

HTTP

Used to configure the kernel network interfaces, implemented at the time of booting to configure the necessary interfaces, used for debugging or tuning the system, and primarily used in Linux

IFCONFIG

Provides the user with IP, subnet mask, and default gateway for each network adapter, can be used to release all connection's and renew all adapter, and primarily used in Windows

IPCONFIG

A server administrator is tasked to harden the database servers, and one of the requirements is to document any firewall ports that are open and closed. Which native Windows command line utility should the administrator use?

NETSTAT

Displays information about active ports, useful troubleshooting and capacity management, Displays routing information for network adapters, available in Windows, MacOS, and Linux.

NETSTAT

An organization needs to perform an analysis to identify vulnerabilities such as open firewall ports, unauthorized operating systems or device types, and weak passwords. Which tool is recommended?

NMAP

Scans networks to find hosts and open ports, helps determine what is deployed on a network, and not native to either Linux or Windows but can be used with both

NMAP

Displays some DNS information, troubleshoots DNS problems, useful in displaying names to IP address mappings, and native to both Windows and Linux

NSLOOKUP

Test connectivity to other hosts, sends an ICMP echo request to a host and listens for the reply, useful in troubleshooting connectivity issues, and measures latency between two devices

PING

What command is used to test the reachability of a host on an IP network and measure round-trip time? a) traceroute b) ipconfig c) ping d) nslookup

Ping

Which command displays the configuration of network interfaces on your system? Can pick more than one option. a) ifconfig b) ipconfig c) netstat d) route

ifconfig/ipconfig

What command displays network connections, routing tables, interface statistics, and more? a) arp b) netstat c) route d) telnet

netstat

Which command is used to establish a connection to a remote host using the Telnet protocol? a) ssh b) telnet c) ftp d) ping

telnet