TCP/IP & OSI
A workstation sends a SYN to a server but never receives a SYN-ACK. Which handshake response is missing?
SYN-ACK
A technician connects securely to a remote Linux server using port 22. Identify the protocol.
SSH
This IP version uses 128-bit addresses.
IPV6
This service automatically assigns IP configuration information to network clients.
DHCP
This network device connects wireless clients to a wired LAN
ACCESS POINT
What resource should a technician consult for established procedures, configurations, or known solutions instead of guessing?
TCP
A legacy management interface transmits credentials in plaintext over TCP port 23. Which protocol is being used?
TELNET
A computer assigns itself a 169.254.x.x address after failing to obtain a DHCP lease. Identify the addressing mechanism.
APIPA
This DNS record maps a hostname to an IPv4 address.
A RECORD
This device typically converts an ISP's fiber-optic signal into an Ethernet connection.
ONT
A computer knows the destination IP is outside its subnet but doesn't know the gateway's MAC address. Which protocol must it use?
ARP
An administrator needs to remotely control a Windows desktop using its standard remote desktop service. Identify the port.
3389
This IPv6 address type typically begins with FE80 and is used for communication on the local link.
LINK-LOCAL
During DORA, this message is sent by a DHCP server to offer an available address.
OFFER
A small office wants to separate guest traffic from employee traffic using logical network segmentation. Identify the technology.
VLAN
This TCP flag is used to initiate a graceful connection termination.
FIN
An employee cannot access shared folders on a Windows file server. The technician checks whether this TCP port is blocked.
445
A company uses one public IPv4 address to allow several private devices to access the internet. Identify the technology.
NAT
A company wants a printer to receive the same IP address each time it requests a DHCP lease. Identify the DHCP feature.
RESERVATION
A technician can ping 8.8.8.8 but cannot open websites by hostname. Identify the service most likely malfunctioning.
DNS
A packet must travel outside its local subnet. This device receives the packet and forwards it toward another network.
ROUTER
A mail client retrieves messages while keeping them synchronized across multiple devices. Identify the protocol.
IMAP
A technician configures 192.168.10.25 with a /24 prefix. Identify the dotted-decimal subnet mask.
255.255.255.0
An organization needs to specify which mail server receives email for its domain. Identify the DNS record.
MX
A home office computer can reach local devices but not internet destinations. Its IP and subnet mask are correct. Identify the configuration value the technician should check.
GATEWAY