Brainbench question in Unix Administration

i have attached Brainbench question and answers in unix Administraton as follows:

1.Command: telnet localhost 25
Question: A system administrator types in the above command.Which one of the following does this command do? It perfoms a port scan of the localhost
It tries to connect to the localhostwith the tomeout of 25 seconds
It attempts to compromise the local system's security
It sends 25 SYN packets to the localhost & then connects
Answers: 3

2.Excessive context switching is an indication of which one of hte following? A disk botleneck

A streamlined system
Insufficient swap space
Insufficient memory
A CPU bottleneck
Answers:4

3. sample.fil:

Red&Grey
Blue^green
Green&yellow
Orange+Black
Beige^gold
Referring to the sample.fil above, how many lines does teh following command return?
grep -i ^g sample.fil

0
1
2
3
4
Answers:2