Networking Fundamentals Flashcards by Matt Miller

FTP port

20 (incoming)

21 (outgoing)

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SFTP/SSH port

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Telnet port

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SMTP port

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DNS port

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POP3 port

110

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NTTP port

119

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Samba port

139

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IMAP port

143

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SNMP port

161

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HTTPS port

443

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SMTP over SSL port

465

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IMAP over SSL port

993

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POP3 over SSL port

995

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/etc/services

A file providing a mapping between textual names for internet services ad the underlying assigned port numbers and protocol types

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tcpdchk

command used to check the syntax of /etc/inetd.conf

ifdown eth0

Used to deactivate a network interface

ifconfig eth0 10.0.0.0 netmask 255.255.255.0

Set eth0 IP address to 10.0.0.0 with class c netmask

route add default gw 192.168.1.1

Create a defualt route using a gateway of 192.168.1.1

dig hostname mx

dig mx hostname

Returns the mx record for the specified hostname

Configuration file that tells Linux how to handle DNS and hosts

/etc/nsswitch.conf