1. Which layer of the OSI model does switches function? 2. Describe the network
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Question
1. Which layer of the OSI model does switches function?
2. Describe the network security advantage of using a VLAN.
3. A router, similar to a VLAN, can subdivide a large network into smaller sections. However, a VLAN offers more advantages. Describe the advantages of use VLANS as compared IP sub-netted networks?
4.
Linux will store DNS network forensic evidence in /var/log/messages file. Since Linux stores a lot of evidence, the grep commands is used to filter the message log and will search for www.reddit.com
The following is a sample of one DNS forward lookup.
5. Why is baselining DNS evidence important?
6. Why does the domain name facebook.com have multiple DNS A records or host IP records?
7. Using DNS network forensics how can you determine is an employee is inappropriately viewing Netlex on a company's computer – during work hours?
# grep reddit.com /var/log/messages 1456702040.91998411192.168.75.6 1192.168.75.1 INIlwww.reddit.com.IIAI 1 198.41.208.136112971111Explanation / Answer
1.
data link layer is used for switches functions
2 following are the advantages of using network security advantage of using a VLAN
When users on a VLAN move to a new physical location but continue to perform the same job function, the end-stations of those users do not need to be reconfigured. Similarly, if users change their job functions, they need not physically move: changing the VLAN membership of the end-stations to that of the new team makes the users' end-stations local to the resources of the new team.
Flooding of a packet is limited to the switch ports that belong to a VLAN.
3 this questions solution can be explained by the following scenario
You can have one physical network and configure two or more logical networks by simply assigning different subnets, like 192.168.0.0 and 192.168.1.0. The problem, though, is that both subnets transmit data through the same switch. Traffic going through the switch can be seen by all other hosts, no matter which subnet they’re on. The result is that security is low and there will be less bandwidth available since all traffic uses the same backbone.
As an alternative, you can create a VLAN for each logical network. Bandwidth availability for each VLAN (or logical network) is no longer shared, and security is improved because the switch that connects each VLAN network (in theory…) will not allow traffic to cross between the VLANs.
4. Question is not asked properly
5. following are the advantage of using baslining DNS evidence
a. Use the DNS Server for DNS Logging
b.Collect Network Activity on Endpoints
6. one server cann't handle the tarffic of facebook at alone, so multiple dns or host IP are used
7. monitoring can be done by the netflix's DNS server, if some employee's ip is accssing netflix DNS,, he can be caught.
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