Answer Posted / sunilbaglur

the differnt types of port nos and its uses are

http 80/tcp World Wide Web HTTP
https 443/tcp http protocol over TLS/SSL
smtp 25/tcp Simple Mail Transfer
snmp 161/tcp SNMP
ftp-data 20/tcp File Transfer [Default Data]
ftp 21/tcp File Transfer [Control]
ftps-data 989/tcp ftp protocol, data, over TLS/SS
ftps 990/tcp ftp protocol, control, over
TLS/SSL
telnet 23/tcp Telnet
telnets 992/tcp telnet protocol over TLS/SSL
nfs 2049/tcp Network File System - Sun
Microsystems
pop2 109/tcp Post Office Protocol - Version 2
pop3 110/tcp Post Office Protocol - Version 3
imap 143/tcp Internet Message Access Protocol
imaps 993/tcp imap4 protocol over TLS/SSL
tftp 69/tcp Trivial File Transfer
tftps 3713/tcp TFTP over TLS
domain 53/tcp Domain Name Server
nntp 119/tcp Network News Transfer Protocol
dhcpv6-client 546/tcp DHCPv6 Client
dhcpv6-server 547/tcp DHCPv6 Server
ldap 389/tcp Lightweight Directory Access
Protocol
sftp 115/tcp Simple File Transfer Protocol
ssh 22/tcp SSH Remote Login Protocol
msft-gc 3268/tcp Microsoft Global Catalog
msft-gc-ssl 3269/tcp Microsoft Global Catalog with
LDAP/SSL

How can we detect that the other end of a tcp connection has crashed? Can we use "keepalives" for this?

1206

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What is port 445 commonly used for?

1060

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Explain what is the data unit of "transport layer"?

1126

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What is a dns address?

979

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How do I refresh my ip address?

1095

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Why is tcp used?

1025

---

How do I type ipconfig in cmd?

1199

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What is a connection gateway?

1235

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How do I find what ports are being used on my mac?

1129

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How do I check if port 22 is open?

1075

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Is there any training institute for network protocol testing / communication protocol testing / data-com protocol testing?

2576

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EXplain how the TCP/IP suite addresses name service

2787

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How to get a client system IP address

1231

---

How will I know my ip address?

1146

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What is my ip from command line?

1080

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