Networking Fundamentals Flashcards Preview

Linux+ (LXO-104) > Networking Fundamentals > Flashcards

Flashcards in Networking Fundamentals Deck (21):
1

FTP port

20 (incoming)
21 (outgoing)

2

SFTP/SSH port

22

3

Telnet port

23

4

SMTP port

25

5

DNS port

53

6

POP3 port

110

7

NTTP port

119

8

Samba port

139

9

IMAP port

143

10

SNMP port

161

11

HTTPS port

443

12

SMTP over SSL port

465

13

IMAP over SSL port

993

14

POP3 over SSL port

995

15

/etc/services

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

16

tcpdchk

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

17

ifdown eth0

Used to deactivate a network interface

18

ifconfig eth0 10.0.0.0 netmask 255.255.255.0

Set eth0 IP address to 10.0.0.0 with class c netmask

19

route add default gw 192.168.1.1

Create a defualt route using a gateway of 192.168.1.1

20

dig hostname mx

dig mx hostname

Returns the mx record for the specified hostname

21

Configuration file that tells Linux how to handle DNS and hosts

/etc/nsswitch.conf