OSPF Adjacency Troubleshooting
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Questions and Answers

What type of DNS record is used to map a domain name to the IP address (Version 6) of the computer hosting the domain?

  • AAAA (correct)
  • CNAME
  • NS
  • PTR

    • What is the purpose of the NS record in DNS?

  • To alias one name to another
  • To link to the domain names authoritative nameservers (correct)
  • To map a domain name to the IP address of the computer hosting the domain
  • To support reverse name lookups

    • What does the Canonical Name record (CNAME) do in DNS?

  • Supports reverse name lookups
  • Tells anyone visiting that subdomain to use the same DNS records as another domain / subdomain (correct)
  • Associates the domain serial number with its owner
  • Correlates a host name with an IP address

    • What type of DNS record is used to support reverse name lookups?

    <p>PTR</p> Signup and view all the answers

    What type of DNS record associates the domain serial number with its owner?

    <p>SOA</p> Signup and view all the answers

    What is the main difference between an AAAA record and an A record?

    <p>One is used for IPv4 and the other is used for IPv6</p> Signup and view all the answers

    What is the primary function of southbound APIs in SDN?

    <p>To enable communication between the controller and the network device</p> Signup and view all the answers

    What is the severity level of syslog that logs informational messages?

    <p>4</p> Signup and view all the answers

    Which interface is used to send traffic to the destination network 10.18.75.113/27?

    <p>G0/6</p> Signup and view all the answers

    What is the purpose of the advertised distance in EIGRP?

    <p>To inform the local router of the bandwidth on the link</p> Signup and view all the answers

    Which of the following is a characteristic of the best route in EIGRP?

    <p>Lowest AD and lowest metric</p> Signup and view all the answers

    What is the role of the reported distance in EIGRP?

    <p>To multiply the delay on the exiting interface by 256</p> Signup and view all the answers

    What is a requirement for two routers to become neighbors?

    <p>All of the above</p> Signup and view all the answers

    What is the next step after the neighboring process?

    <p>Adjacency</p> Signup and view all the answers

    What is exchanged between adjacent routers?

    <p>Database information</p> Signup and view all the answers

    How do routers become neighbors?

    <p>By agreeing on several parameters</p> Signup and view all the answers

    What is sent periodically out of each interface using IP multicast?

    <p>Hello packets</p> Signup and view all the answers

    What is the purpose of the Hello protocol?

    <p>To facilitate neighbor election</p> Signup and view all the answers

    What is the purpose of the serial number in a DNS zone file?

    <p>To show the revision history of the DNS zone file</p> Signup and view all the answers

    What is the recommended format for the serial number in a DNS zone file?

    <p>YYYYMMDDnn</p> Signup and view all the answers

    How often will a slave DNS server refresh from the master DNS server with a refresh time of 86000?

    <p>Every 86,000 seconds</p> Signup and view all the answers

    What is the purpose of the refresh time in a DNS zone file?

    <p>To specify how often the slave DNS server will poll the master DNS server</p> Signup and view all the answers

    How should the email address of the domain administrator be written in a DNS zone file?

    <p>root.ns.nameserver.com</p> Signup and view all the answers

    What is the recommended time range for the refresh time in a DNS zone file for a regular Internet server?

    <p>Between 6 to 24 hours</p> Signup and view all the answers

    What is the function of a name resolver?

    <p>To query a name server for IP address information</p> Signup and view all the answers

    What is the purpose of a local database of address mappings?

    <p>To improve DNS query performance</p> Signup and view all the answers

    What does the 'no ip domain-lookup' command do on a Cisco device?

    <p>Disables DNS services</p> Signup and view all the answers

    What are two benefits of using private IPv4 addressing?

    <p>They provide a layer of security from Internet threats and alleviate the shortage of public IPv4 addresses</p> Signup and view all the answers

    What is the function of Cisco Advanced Malware protection for next-generation IPS?

    <p>Inspecting specific files and files types for malware</p> Signup and view all the answers

    What component of a URL indicates the location or organization type?

    <p>Domain</p> Signup and view all the answers

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