[Internet-e-architetture-di-rete] esercizi uso resolver e authoritative

[Antonio Prado]

On 5/13/16 10:31 PM, Abigail Bianconi wrote:
> ==============================
> 1. | qual e' il RR IN MX per il nome a dominio ripe.net.?|
> ==============================
> R1.  
> 
> dig ripe.net <http://ripe.net> MX +short
> 250 molamola.ripe.net <http://molamola.ripe.net>.
> 200 mahimahi.ripe.net <http://mahimahi.ripe.net>.
> 
> dig @c1.authdns.ripe.net <http://c1.authdns.ripe.net>. ripe.net
> <http://ripe.net> MX +short
> 200 mahimahi.ripe.net <http://mahimahi.ripe.net>.
> 250 molamola.ripe.net <http://molamola.ripe.net>.

e' sufficiente interrogare un solo autoritativo

> dig @8.8.8.8 <http://8.8.8.8> ripe.net <http://ripe.net> MX +short
> 200 mahimahi.ripe.net <http://mahimahi.ripe.net>.
> 250 molamola.ripe.net <http://molamola.ripe.net>.
> 
> ==============================
> 2. | qual e' il RR IN AAAA di $1?
> ==============================
> 
> R2.       
> 
> dig ripe.net <http://ripe.net> AAAA +short
> 2001:67c:2e8:22::c100:68b

questa query e' superflua

> ==============================
> 3. | qual e' il RR IN PTR di $2?
> ==============================
> 
> R3
> 
> dig -x 2001:67c:2e8:22::c100:68b ptr +shor
> www.ipv6.ripe.net <http://www.ipv6.ripe.net>.

questa query e' superflua

> ==============================
> 5. | qual e' il RR IN A di $4?
> ==============================
> 
> R5
> 
> dig google.com <http://google.com> +shor
> 172.217.19.206

questa non e' giusta poiche' $4 e' la risposta alla domanda 4

> ==============================
> 6. | qual e' il RR IN PTR di $5?
> ==============================
> 
> R6
> 
> dig -x 172.217.19.206 PTR +shor
> fra02s21-in-f14.1e100.net <http://fra02s21-in-f14.1e100.net>.

e di conseguenza non e' giusta neanche questa poiche' $5 e' la risposta
alla domanda 5

il resto e' ok.
correggi e procedi

grazie
--
antonio


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