Network Commands Flashcards
What is the most basic command tool for testing connectivity to other hosts?
ping
What command tool sends an Internet Control Message Protocol (ICMP) echo request to a host and listens for a reply?
ping
With a ping command, if a reply is received from the ICMP echo request, what two things will be displayed?
Time it took and Time to Live (TTL) left
What network command has many options for seeing attributes of a request like the maximum TTL, IPv4/IPv6, and the numbers of requests to send that is useful in troubleshooting connectivity with other devices?
ping
With a ping command, if a reply is not received from the ICMP echo request, what will you receive?
a timeout message
A ping’s timeout message could indicate one or both of these issues?
Connectivity issues and/or firewall issues
Due to the time it takes to get a response from a ping request, the what between two devices can be measured that enables network engineers to troubleshoot performance problems?
latency
What network commands is used to trace the IP route an IP packet takes to a destination?
traceroute/tracecert
What network command displays each hop (next router) in a numerical list with the hop’s IP address and the time it takes to receive the packet?
traceroute/tracecert
With traceroute/tracecert, what command is used for Linux systems and what is used for Windows?
Linux - traceroute
Windows - tracecert
What network command can be useful when a ping fails, troubleshooting performance issues, and other aspects regarding connectivity?
traceroute/tracecert
What network commands is similar to traceroute or tracecert in that it displays the path taken by a packet from its source to its destination?
tracepath
What network command is useful because it can be used by any user instead of needing superuser privilege and primarily used in Linux?
tracepath
What network commands provides the user with the IP, subnet mask, and default gateway for each network adapter by default with the /all option information, such as MAC address, DHCP status, and lease information?
ipconfig (internet protocol configuration)
What network command can be used to release all connections and renew all adaptors that are primarily used in Windows?
ipconfig/release
What network command is used to the configure the kernel network interface, implemented at the time of booting to configure the necessary interfaces?
ifconfig
What linux network command occurs once the interfaces are configured, it is used for debugging or timing the system?
ifconfig
What network command displays the IP to physical (MAC) address mapping for hosts that have been discovered in the cache?
ARP (address resolution protocol)
What network command can be used to add, remove or modify entries in the ARP cache?
ARP
What network commands displays information about the active ports and their state and can be useful in troubleshooting and capacity management?
netstat
What network command displays routing information for network adaptors?
netstat-r
What network command displays information for displaying DNS information and DNS problems? It is useful in displaying names to IP address mappings.
nslookup
What network is a command used to query the DNS name servers and can be helpful in troubleshooting DNS problems. It is also used for lookups and will display answers from the query.
dig
What network command is a replacement for nslookup?
dig
What network command is a tool most often used to lookup who owns a domain or block of IP addresses on the internet, including name, email address, and physical address?
whois
The whois command is primarily is used in what OS?
Linux
What network command can be used to display the current route tables on a host and can be used to add or remove routes?
route
What network command can be used to determine where to send traffic means the default gateway, where the router sends things if it is not otherwise defined in the routing table?
route
What network command is used to securely copy files between servers, leveraging SSH for authentication and encryption?
SCP (secure copy protocol)
What network command copies the file from one host to another host?
ftp (File Transfer Protocol
If encryption is needed in ftp, what does it use?
SSL(Secure Sockets Layer)/TLS (Transport Layer Security)
An ftp transfer uses what protocol for reliability and is often used on the internet and other WAN?
TCP (transmission control protocol)
What network commands transfers a file from either a client to a server or from a server to a client using UDP instead of TCP?
tftp (trivial file transfer protocol)
What does UDP stand for?
User datagram protocol
What network command displays information about a user or users on a remote system, including things such as last log-in time and username? Primarily used in Linux
finger
What network commands scans networks to see what it can be find in terms of hosts or open ports?
nmap
What network command is commonly used to determine what is deployed on a network for vulnerability analysis, security scans, and related activities?
nmap
What network command is not native to either Linux or Windows, but can be downloaded for free and used with both?
nmap
What network command displays the TCP/IP packets and other network packets that are being transmitted over the network system?
tcpdump
tcpdump is a network command that is a form of what and is designed to show the contents of network packets in human-readable form for troubleshooting, analysis, etc?
protocol analyzer (sniffer)
tcpdump is not native to what, but can be downloaded and used with both?
Linux
What network command allows user to manage accounts and devices remotely?
telnet/ssh
What is the difference between telnet and ssh?
SSH is encrypted, telnet is not encrypted
