Delete CT3531 exam materials

third/semester1/CT3531: Network & Data Communications II/exam_notes.txt

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-- answer 4 out of 5 questions
-- "the questions never change, only the answers do"
-- trickiest bits are design elements 
-- need to be able to do subnetting
-    - won't be doing IPv6 subnetting
-
-- 300 words is about page, should take about 12-15 minutes

third/semester1/CT3531: Network & Data Communications II/papers/exam_papers_answers.txt

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-Question 1.
-a)  (i)     10.16.0.0/16
-            4 bits needed for subnetting.
-            Leaves 12 bits for host addressing.
-            2^12 = 4096
-
-            Subnet mask will be /20 or 255.255.240.0 (don't need to know dotted decimal notation)
-        
-    (ii)    Will never ask the last one (again).
-            First subnet: 10.16.10.0./20
-                Hosts: 10.16.0.1 --> 10.16.15.254
-                Broadcast: 10.16.15.255
-            Second subnet: starts from where the first left off
-                Hosts: 10.16.16.1 --> 10.16.31.254
-                Broadcast: 10.16.31.255
-
-    (iii)   10.16.0.0/13
-                which represents everything form 10.16.0.0 --> 10.23.0.0
-b)
-    - a good answer will be about page
-    - write legibly
-    - no competitor for DNS.
-    - don't expect us to know competitors for GNS3
-    - IXPs are well covered in the notes.
-        - why do IXPs exist?
-            - to keep internet routing as efficient and local as possible
-        - what do they do?
-
-Question 2.
-a)  Reasons to use VLANs:
-        - keep traffic separate
-            - security
-        - limit broadcast traffic
-
-
-    VLAN 1 is usually reserved as the "Native VLAN"
-    VLAN ID is 12 bits so maximum is 4096.
-    Any valid VLAN ID and subnet is acceptable
-
-b)  `e0` would be dot1q because it is a trunk port: tags traffic for VLANs
-    `e1` would be dot1q because it is a trunk port: tags traffic for VLANs
-    `e2` is an access port for the Support VLAN
-
-    802.1q tags ethernet headers to add the VLAN ID so the packet goes to the correct VLAN.
-    Also have 3 bits which define priority for the packet.