1. Many business computers have three distinct and worldwide unique identifiers. What are they?2. In Fig. 7-4, there is no period after laserjet. Why not? Authoritative data for cs.vu.nl cs.vu.nl. 86400 IN SOA star boss (9527,7200,7200,241920,86400) cs.vu.nl. 86400 IN MX 1 zephyr cs.vu.nl. 86400 IN MX 2 top cs.vu.nl. 86400 IN NS star star 86400 IN A 130.37.56.205 zephyr 86400 IN A 130.37.20.10 top 86400 IN A 130.37.20.11 www 86400 IN CNAME star.cs.vu.nl ftp 86400 IN CNAME zephyr.cs.vu.nl flits 86400 IN A 130.37.16.112 flits 86400 IN A 192.31.231.165 flits 86400 IN MX 1 flits flits 86400 IN MX 2 zephyr flits 86400 IN MX 3 top rowboat IN A 130.37.56.201 IN MX 1 rowboat IN MX 2 zephyr little-sister IN A 130.37.62.23 laserjet IN A 192.31.231.216 Figure 7-4. A portion of a possible DNS database for cs.vu.nl.

1. Many business computers have three distinct and worldwide unique identifiers. What are they? 2. In Fig. 7-4, there is no period after laserjet. Why not? Authoritative data for cs.vu.nl cs.vu.nl....

1. Many business computers have three distinct and worldwide unique identifiers. What are they?

2. In Fig. 7-4, there is no period after laserjet. Why not?

Authoritative data for cs.vu.nl
cs.vu.nl.	86400	IN	SOA	star boss (9527,7200,7200,241920,86400)
cs.vu.nl.	86400	IN	MX	1 zephyr
cs.vu.nl.	86400	IN	MX	2 top
cs.vu.nl.	86400	IN	NS	star
star	86400	IN	A	130.37.56.205
zephyr	86400	IN	A	130.37.20.10
top	86400	IN	A	130.37.20.11
www	86400	IN	CNAME	star.cs.vu.nl
ftp	86400	IN	CNAME	zephyr.cs.vu.nl
flits	86400	IN	A	130.37.16.112
flits	86400	IN	A	192.31.231.165
flits	86400	IN	MX	1 flits
flits	86400	IN	MX	2 zephyr
flits	86400	IN	MX	3 top
rowboat		IN	A	130.37.56.201
		IN	MX	1 rowboat
		IN	MX	2 zephyr
little-sister		IN	A	130.37.62.23
laserjet		IN	A	192.31.231.216

Figure 7-4. A portion of a possible DNS database for cs.vu.nl.

May 25, 2022