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@ -21,7 +21,7 @@ tags:
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- [cosc203-lab16](notes/cosc203-lab16.md)
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- [cosc203-lab17](notes/cosc203-lab17.md)
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- [cosc203-lab18](notes/cosc203-lab18.md)
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-
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- [cosc203-lab19](notes/cosc203-lab19.md)
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# Notes
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[dns](notes/dns.md)
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51
content/notes/cosc203-lab19.md
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51
content/notes/cosc203-lab19.md
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---
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title: "cosc203-lab19"
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aliases:
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tags:
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- cosc203
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- lab
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---
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1. DNS request protocol is UDP
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2. The ports of the DNS queries are:
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1. dest of query: 53 
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2. source of response: 53 
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3. There were 12 dns queries. They were all type A 
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4. Anwers within responses
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1. 2 answers 
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2. 3 
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3. 1 
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4. 1 
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5. 7 
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6. 6 
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5. dns responses after nslookup on www.otago.ac.nz
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1. 
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2. 
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3. 
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4. 
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5. 
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6. 
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7. 
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8. 
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9. 
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6. destination is 10.64.0.112. this is one of my local dns servers  
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7. name servers are
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1. 
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2. 
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3. 
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8. nslookup google
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1. 7 queries
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2. 10.64.0.112 (local dns server) and 216.239.34.10 (the address of the google ns2 nameserver)
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9. only one answer (two of the requests were refused and has no answer). each one contains a dns record
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10.
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@ -2,49 +2,19 @@
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title: "cosc203-lab20"
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aliases:
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tags:
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- cosc203
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- lab
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- cosc203
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---
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1. DNS request protocol is UDP
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2. The ports of the DNS queries are:
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1. dest of query: 53 
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2. source of response: 53 
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3. There were 12 dns queries. They were all type A 
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4. Anwers within responses
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1. 2 answers 
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2. 3 
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3. 1 
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4. 1 
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5. 7 
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6. 6 
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5. dns responses after nslookup on www.otago.ac.nz
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1. 
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2. 
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3. 
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4. 
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5. 
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6. 
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7. 
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8. 
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9. 
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6. destination is 10.64.0.112. this is one of my local dns servers  
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7. name servers are
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1. 
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2. 
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3. 
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8. nslookup google
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1. 7 queries
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2. 10.64.0.112 (local dns server) and 216.239.34.10 (the address of the google ns2 nameserver)
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9. only one answer
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1. header
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1. 4 fields
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1. source port
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2. dest port
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3. length
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4. checksum
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2. each field is 2 bytes
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2. payload is 980 bytes
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