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Virtual networks.txt

Guest on 12th September 2021 07:47:16 AM

  1. VIRTUAL NETWORKS
  2.  
  3. Explain the main differences of the performance results between Bare-Metal server and Oracle VM server
  4. - Based on Swingbench results, the single Oravle VM server can support a variety of work load
  5.   in a virtualized enviroment as justified by the 4% and 8% overhead. The dual Oracle VM server
  6.   indicated that there was performance scalability improvement. The LMbench results proved that
  7.   Oracle VM achieved significant perentages in latency and bandwidth. Oracle VM is a viable option for
  8.   i.e. small enterprises as it is cost efficient and scalable.
  9.  
  10. Explain the functionality of the used Swingbench and LMbench benchmarking tools  
  11. - Swingbench was used to evaluate transactions per minute. It was used to evaluate performance and scalability
  12.   in both virtualized and bare-metal. It is specifially desingned to generate load and stress to a Oracle
  13.   database. LMbench was used to monitor the impact of virtualization on hardware recouscers by measuring
  14.   bandwidth and latency.
  15.    
  16. Q1: Find information about iptables? What is it and what is it used for?
  17. - It is used to configure the tables provided by the linux kernel firewall. It can be used to develope firewalls
  18.   and routers.
  19.  
  20. Q2: Find information about IP forwarding and shortly descibe it?
  21. - IP forwarding, also known as internet rouring is a process that determines which path a packet can be sent.
  22.   It uses routing information to make decisions and is used to send a packet over multiple networks.
  23.  
  24. Q3: Explain commands inside the "iptables.cfg" file.
  25. - "-A" appends the rule to rule chain, "-m conntrack" allows filter rules to match based on connection
  26.   state, "--ctstate ESTABLISHED,RELATED" defines the states for the rule to match to, "-j ACCEPT" jumps
  27.   to specified target and "-t nat" selects nat for configuration of nat rules
  28.  
  29. Q4: Find information about bind9? What is it and what is it used for?
  30. - bind9 is the most widely used DNS software. It is used to configure and maintaing DNS servers
  31.  
  32. Q5: Explain the "zone" term and numeric parameters in the zone definition.
  33. - Zone is the name space that is allocated to a specific server, the numbers are: the serial number of the
  34.   zone file and in seconds the time for slave refresh, slave retry time in case of a problem, slave
  35.   expiration time and the maxium caching time in case of failed lookups
  36.  
  37. Q6: Explain the "reverse zone" term.
  38. - Reverse Zone is a zone file that allows the mapping of an ip address to a domain name. Reverse Zone is
  39.   mapping the ip address to hostname
  40.  
  41. Q7: Explain what is DHCP server and what is it used for?
  42. - The Dynamic Host Configuration Protocol is protocol used on IP networks. It dynamically configures ip
  43.   addresses and other information that is needed in internet communication. It allows automatically to
  44.   receive ip addresses from a centra dhcp server.
  45.  
  46. Q8: Explain all the DHCP server parameters which you have just configured.
  47. - Subnet is the logically visible subdivision of an ip network and netmask is the identifier of the host.
  48.   The range is the range of the host ips. The lease time is the time the ip is leased
  49.  
  50. Q9: Explain what is tasksel
  51. - Tasksel is tool that installs related packages as coordinated task
  52.  
  53. Q10: List the main components of the LAMP server
  54. - LAMP server is a computer that has linux as operating system and in linux, it has installed apache, mysql
  55.   and php

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