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Network+(N10-005) Cram Notes

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1.5 Identify common TCP and UDP default ports.

Protocol

IP protocol

Port Used

FTP (File Transfer Protocol)

TCP

21

SFTP (Secure FTP)

SCTP,TCP

22

FTPS (FTP Secure)

FTP

443

TFTP (Trivial FTP)

UDP

69

Telnet

TCP

23

HTTP (Hyper Text Transfer Protocol)

TCP

80

HTTPS (HTTP Secure)

TCP

443

SCP (Secure Copy)

SCTP, TCP

22

SSH (Secure SHell)

SCTP, TCP

22

SMTP (Simple Mail Transfer Protocol)

TCP

25

DNS (Domain Name Service))

UDP

53

SNMP (Simple Network Management Protocol)

TCP, UDP

161

SNMP Trap (Simple Network Management Protocol Trap )

TCP, UDP

162

ISAKMP (VPN) Internet Security Association and Key Management Protocol (virtual private network)

UDP

500

TACACS (Terminal Access Controller Access-Control System)

TCP,UDP

49

POP3 ( Post Office Protocol version 3)

TCP

110

NNTP (Network News Transfer Protocol)

TCP

119

IMAP4 (Internet message access protocol version 4)

TCP

143

Kerberos

UDP

88

Syslog

TCP,UDP

514

L2TP (Layer 2 Tunneling Protocol)

UDP

1701

PPTP (Point-to-Point Tunneling Protocol)

TCP

1723

RDP (Remote Desktop Protocol)

TCP, UDP

3389

1.6 Explain the function of common networking protocols.

  • TCP/IP is the protocol, which is used by all internet applications such as WWW, FTP, Telnet etc. IPX/SPX is proprietary protocol stack of Novell NetWare.

  • UDP (User Datagram Protocol): UDP is a thin protocol. UDP is a connectionless protocol. It doesn't contact the destination before sending the packet and doesn't care whether the packet is reached at the destination.

  • Telnet is used for terminal emulation that runs programs remotely. Telnet uses TCP/IP protocol. Telnet requires a username and password to access. It is client-server protocol

  • FTP (File Transfer Protocol) is a connection oriented protocol. It uses TCP/IP for file transfer. It is client-server protocol

  • TFTP (Trivial File Transfer Protocol) that uses UDP (Connectionless protocol).

  • SNMP is part of TCP/IP protocol suite. It allows you to monitor and manage a network from a centralized place by using SNMP Manager software. The systems or devices that provide the responses are called agents (or MIBs). An SNMP agent is any computer running SNMP agent software. MIB stands for Management Information Base. It is part of SNMP agent database. A MIB records and stores information abut the host it is running on. An SNMP manager can request and collect information from an agent's MIB. Routers are typical MIB agents. SNMP agent generates "trap" messages that are then sent to an SNMP management console, which is a trap destination.

  • HTTP is the protocol used for accessing the World Wide Web services. HTTP operates over TCP/IP. 15. TCP: TCP is a full-duplex, connection-oriented protocol. It incorporates error checking as well.

1.7 Summarize DNS concepts and its components

  • The most common type of DNS record is a Host record (also called an A record). In the Internet, a Host record is used to associate a domain name (FQDN Fully Qualified Domain Name) with an IP address.
    An MX record stores the IP address of your SMTP server, so e-mail clients can determine where a message should be sent. They perform a DNS query against a domain's MX record to get the IP address of the organization's SMTP server.

  • An Alias record's job is to associate an alternate name with a computer for which there is already a Host record. For example, suppose that the host record for relevant looked like this: Relevant Host (A) 200.100.100.199

  • Alias record is like a redirect. For example, you have a site mydomain.com. However, someone enters www.mysite.com, You want him or her to be directed to the web.mysite.com. Since there is no server on the network named "www," set up an Alias record that associates www with mysite.com. The Alias record looks something like this: www Alias (CNAME) mysite.com

  • MAC address record is not associated with DNS server records

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