Module 4: Protocols (INCOMPLETE)
When surfing online, you get some strange data on an apparently secure website, and you realize you need to check the legitimacy of the site. What kind of organization issues digital certificates for websites?
Certificate Authority
What field in a TCP segment is used to determine if an arriving data unit exactly matches the data unit sent by the source?
Checksum
Which IPsec encryption type encrypts the IP header?
ESP
Which protocol's header includes the source MAC address?
Ethernet
What protocol must be allowed through a firewall for tracert to work correctly?
ICMP
Which encryption protocol does GRE use to increase the security of its transmissions?
IPsec
What OSI layer does IP operate?
Network Layer
What is one advantage offered by VDI over RDS and VNC?
Offers access to multiple OSs in VMs
Which secured tunneling protocol might be able to cross firewalls where IPsec is blocked?
OpenVPN
You need to determine which device on your network is sending excessive messages to your Ubuntu Server. Which utility will give you this information?
Tcpdump
What process is used to establish a TCP connection?
TCP Three-Way Handshake
What is the Internet standard MTU?
1,500 bytes
An ARP table maps MAC addresses to what information?
IPv4 addresses
Which encryption benchmark ensures data is not modified after it's transmitted and before it's received?
Integrity
Which port must be open for RDP traffic to cross a firewall?
Port 3389
Which remote file access protocol is an extension of SSH?
SFTP
Which remote file access protocol uses port 22?
SFTP
You need to remote into a Linux server in another building on your network. Which protocol should you use?
SSH
You're working from home and need to access a file server at the office while working in an application from your work desktop. At the same time, you often stream music in your browser. Which VPN type will be most efficient while still meeting your needs?
Split tunnel VPN
What OSI layer does TCP operate?
Transport Layer
Which terminal emulation protocol is similar to RDP but is open source?
VNC
You're getting a duplicate IP address error on your computer and need to figure out what other device on your network is using the IP address 192.168.1.56. What command will show you which MAC address is mapped to that IP address?
arp -a
List all active TCP/IP connections on the local machine, including the transport layer protocol used (usually just TCP), messages sent and received, IP address, and state of those connections.
netstat
List all current TCP connections and all listening TCP and UDP ports.
netstat -a
List the name of each process using a connection and information about the connection. Requires elevated permissions
netstat -b
Display statistics about messages sent over a network interface, including errors and discards
netstat -e
List current connections, including IP addresses, ports, and FQDNs.
netstat -f
List current connections, including IP addresses and ports
netstat -n
List the PID (process identifier) for each process using a connection and information about the connection.
netstat -o
Display routing table information.
netstat -r
Display statistics about each message transmitted by a host, separated according to protocol type (TCP, UDP, IP, or ICMP).
netstat -s