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DHCP
NAT
IPv6
Commands
FLASH
100
The DHCPOFFER message is sent as a ________, using the L2 MAC address of the server as the source address and the L2 address of the client as the destination.
What is unicast?
100
The set of networks that are subject to translation
What is inside network?
100
This is a technique to increase the reliability of the Internet connection of an IP network. With IPv6, a host can have multiple IP addresses over one physical upstream link.
What is multihoming?
100
Use this command in DHCP to exclude specific addresses
What is ip dhcp excluded-address?
100
R1#show running-config ---output omitted--- ip dhcp excluded-address 192.168.123.1 192.168.123.10 ! ip dhcp pool MGRs-hosts network 192.168.123.0 255.255.255.0 dns-server 192.168.123.3 172.16.1.3 ! interface FastEthernet0/0 ip address 192.168.123.1 255.255.255.0 A network technician determines DHCP clients are not working properly. The clients are receiving IP configuration information from a DHCP server configured on the router but cannot access the Internet. From the output in the graphic, what is the most likely problem?
What is the pool does not have a default router defined for the clients?
200
The _________ message is a duplicate of the DHCPOFFER, except for a change in the message type field.
What is DHCPACK?
200
This type of NAT uses one-to-one mapping of local and global addresses
What is static?
200
This transition mechanism allows a smooth integration of IPv4 to IPv6, uses the reserved prefix 2002::/16 to allow an IPv4 internet-connected site to create and use a /48 IPv6 prefix based on a single globally routable or reachable IPv4 address.
What is 6to4 or 6to4 tunneling?
200
This command is used to configure an Ethernet interface of a cisco router as a DHCP client
What is ip address dhcp?
200
This type of NAT is what a network administrator should use to ensure that a web server on the inside network is always available to the outside network.
What is static?
300
With this feature, a Windows computer can automatically assign itself an IP address in the 169.254.x.x range in the event that a DHCP server is not available or does not exist on the network.
What is Automatic Private IP Addressing (APIPA)?
300
NAT conserves the legally registered addressing scheme through ______________________. With NAT overload, internal hosts can share a single public IP address for all external communications.
What is application port-level multiplexing?
300
TRUE or FALSE. The shorthand method of representing successive fields of zeros as two colons "::" can be used more than once in an address.
What is FALSE.
300
To configure a router as a DHCP relay agent, you need to configure the nearest interface to the client with this command
What is ip helper-address?
300
R1 --------------- R2 | | | | | | \ / --- SWITCH ---- | | | Host A This topology has _____ IPv6 broadcast domains.
What is 0?
400
This 32-bit identification is generated by the client to allow it to match up the request with replies received from DHCP servers.
What is transaction identifier?
400
One disadvantage of NAT is that it increases _______________ because the translation of each IP address within the packet headers takes time which affects performance
What is switching delays?
400
Systems using a 64-bit CPU, bus, or memory structure can pass both the IPv4 source and destination address in a single processing cycle. For IPv6 using a 32-bit CPU, bus or memory, the source and destination addresses requires __________ cycles to process both the source and destination address information.
What is 8?
400
Use this global command to clear dynamic entries before the timeout has expired
What is clear ip nat translation?
400
Your organization is issued the IPv6 prefix of 2001:0000:130F::/48 by your service provider. With this prefix, your organization to can create subnetworks using this number of bits.
What is 16?
500
DHCP uses _________________ as its transport protocol. The client sends messages to the server on port __. The server sends messages to the client on port __.
What are User Datagram Protocol (UDP), 67 & 68
500
Many Internet protocols and applications depend on end-to-end functionality, with unmodified packets forwarded from the source to the destination. NAT prevents some applications that use IP addressing by changing this
What is end-to-end addresses?
500
This standard explains how to stretch IEEE 802 MAC addresses from 48 to 64 bits by inserting the 16-bit 0xFFFE in the middle at the 24th bit of the MAC address to create a 64-bit, unique interface identifier.
What is EUI-64?
500
This command generates a description of each packet considered for translation. This command also outputs information about certain errors or exception conditions, such as the failure to allocate a global address.
What is debug ip nat detailed?
500
Router#show ip dhcp server statistics Message Received BOOTREQUEST 0 DHCPDISCOVER 6 DHCPREQUEST 9 DHCPDECLINE 0 DHCPRELEASE 0 DHCPINFORM 0 Message Sent BOOTREPLY 0 DHCPOFFER 7 DHCPACK 8 DHCPNAK 1 According to the output, this number of addresses have been successfully assigned or renewed by this DHCP server
What is 8?