CompTia

The Server Message Block (SMB)

The Server Message Block (SMB)

protocol that implements Windows File/Printer Sharing is specifically for use on local networks only. Therefore, allowing access from the internet would be a security risk.

TCP/IP protocols

The network administrator could implement a file server or fileshare protocol using TCP/IP protocols, like File Transfer Protocol (FTP), but it only allows a client to upload and download files from a network server and websites.

The Simple Network Management Protocol (SNMP)

provides a means for devices to report operational statistics to a management server, not for file sharing.

The Lightweight Directory Access Protocol (LDAP)

is a TCP/IP protocol used only to query and update an X.500 directory.

Dynamic Host Configuration Protocol (DHCP)

Host servers have a failover mechanism when an IP configuration specifies the use of a Dynamic Host Configuration Protocol (DHCP) server, but the host cannot contact one.

(APIPA)

Windows machines will default to automatic private IP addressing (APIPA) if the DHCP service fails or if there is some connectivity error.

Digital Subscriber Line (DSL)

provides fast downlinks but slow uplinks. A DSL modem might be provisioned as a separate device or be embedded as a function of a small office home office (SOHO) router but is not a protocol.

Preboot eXecution Environment (PXE)

firmware and a network adapter supporting boot options. The client uses a DHCP server to locate a suitably configured server to start the setup process.

(TCP) port 993 (IMAPS) or 995 (POP3S)

The default ports for a secure connection are either transport control protocol (TCP) port 993 (IMAPS) or 995 (POP3S), depending on the mail access protocol in use (IMAP or POP).

TCP port 143 or 110

By default, the unsecure ports are TCP port 143 for IMAPS and TCP port 110 for POP3.

TCP port 25 or 587

Port 25 is for Simple Mail Transfer Protocol (STMP) to send mail between servers and is not secure. Clients often use Port 587 to submit messages for delivery by an SMTP server.

TCP port 80 or 443

The HTTP application uses the unencrypted TCP port 80. The secure version, HTTPS, encrypts traffic between the client and the server, sent over port TCP/443 by default

Domain Name System (DNS)

global hierarchy of distributed name server databases that contain information about each domain and the hosts within those domains.

DNS servers

provide resolution of host and domain names to their IP addresses and are essential for locating resources on the internet.

name server hosting domain

resource records on the internet is for support and is usually configured as the primary DNS server entry in the IP configuration of all clients, not just locally.

Foil twisted pair (FTP)

is associated with Transfer Control Protocol/20 (TCP/20) to transfer data in active mode or a server-assigned port in passive mode.

LDAP

The AAA server uses Lightweight Directory Access Protocol (LDAP) to communicate with the directory service (Active Directory) from an access point with no configured user account credentials, and it cannot decrypt any authentication traffic.

SMB/CIFS

The Simple Network Management Protocol (SNMP) provides a means for devices to report operational statistics to a management server, but it does not communicate with the directory service.

SNMP

Server Message Block (SMB) or Common Internet File System (CIFS) is the application protocol underpinning file and printer sharing on Windows networks and does not communicate with the directory service.

DHCP

The Dynamic Host Configuration Protocol (DHCP) uses broadcast addressing, which means that it must use User Datagram Protocol (UDP) at the transport layer and does not communicate with the directory service.