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You administer Windows 8.1 client computers in your company network. The company has an Active Directory Domain Services (AD DS) domain named contoso.com. The domain contains a domain controller configured to lease DHCP and DHCPv6 addresses.
A client computer named Computer1 is configured to obtain IPv4 and IPv6 addresses automatically.
A user reports that an IPv6-enabled application named App1 is not working on Computer1.
You discover that Computer1 has an IPv6 address prefix of FE80::. You are able to ping Computer1 successfully by using IPv4, but when you use IPv6, your ping requests time out.
You need to ensure that Computer1 will support Appl.
Which command should you use?
A. jpconfig /allcompartments /all
B. jpconfig /renew
C. jpconfig /renew6
D. jpconfig /release6
Correct Answer: C
Explanation/Reference:
http://en.wikipedia.org/wiki/Link-local_address
Link-local address
In a computer network, a link-local address is a network address that is valid only for communications within the network segment (link) or the broadcast domain that the host is connected to. Link-local addresses are usually not guaranteed to be unique beyond a single network segment. Routers therefore do not forward packets with link-local addresses.
Link-local addresses for IPv4 are defined in the address block 169.254.0.0/16, in CIDR notation. In IPv6, they are assigned with the FE80::/10 prefix.
http://technet.microsoft.com/en-us/library/dd197434.aspx
Ipconfig
Displays all current TCP/IP network configuration values and refreshes Dynamic Host Configuration Protocol (DHCP) and Domain Name System (DNS) settings. Used without parameters, ipconfig displays Internet Protocol version 4 (IPv4) and IPv6 addresses, subnet mask, and default gateway for all adapters.
Syntax
ipconfig [/allcompartments] [/all] [/renew [<Adapter>]] [/release [<Adapter>]] [/renew6[<Adapter>]] [/release6 [<Adapter>]] [/flushdns] [/displaydns] [/ registerdns] [/showclassid <Adapter>] [/setclassid <Adapter> [<ClassID>]]
Parameters
/allcompartments
Displays the full TCP/IP configuration for all compartments.
/renew [<Adapter>]
Renews DHCP configuration for all adapters (if an adapter is not specified) or for a specific adapter if the Adapter parameter is included. This parameter is available only on computers with adapters that are configured to obtain an IP address automatically. To specify an adapter name, type the adapter name that appears when you use ipconfig without parameters.
/renew6 [<Adapter>]
Renews DHCPv6 configuration for all adapters (if an adapter is not specified) or for a specific adapter if the Adapter parameter is included. This parameter is available only on computers with adapters that are configured to obtain an IPv6 address automatically. To specify an adapter name, type the adapter name that appears when you use ipconfig without parameters.
/release6[<Adapter>]
Sends a DHCPRELEASE message to the DHCPv6 server to release the current DHCP configuration and discard the IPv6 address configuration for either all adapters (if an adapter is not specified) or for a specific adapter if the Adapter parameter is included. This parameter disables TCP/IP for adapters configured to obtain an IP address automatically. To specify an adapter name, type the adapter name that appears when you use ipconfig without parameters.