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b/third/semester1/CT3531: Network & Data Communications II/papers/exam_papers_answers.txt deleted file mode 100644 index baddb9ef..00000000 --- a/third/semester1/CT3531: Network & Data Communications II/papers/exam_papers_answers.txt +++ /dev/null @@ -1,45 +0,0 @@ -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.