Switching, Routing, and Wireless Essentials Chapters 7-9
What is the destination IP address when IPv4 host sends DHCPDISCOVER message? Which destination IPv4 address does DHCPv4 client use to send initial DHCP Discover packet when client is looking for DHCP server?
255.255.255.255
What method is used by host to verify IPv6 address is unique on local network before assigning that address to interface? What process is used in ICMPv6 for host to verify that IPv6 address is unique before configuring it on interface?
DAD (Duplicate Address Detection)
Which message is sent by a DHCPv4 client to initiate the lease obtaining process? Which DHCP IPv4 message contains the following information? Destination address: 255.255.255.255 Client IPv4 address: 0.0.0.0 Default gateway address: 0.0.0.0 Subnet mask: 0.0.0.0
DHCPDISCOVER
DHCP-enabled client PC has just booted. During which two steps will client PC use broadcast messages when communicating with DHCP server?
DHCPDISCOVER DHCPREQUEST
What kind of message is sent by DHCPv4 client requesting IP address?
DHCPDISCOVER broadcast message
How is DHCPDISCOVER transmitted on network to reach DHCP server?
DHCPDISCOVER message is sent with broadcast IP address as destination address.
Which two DHCPv4 messages are sent by server in lease obtaining process?
DHCPOFFER DHCPACK
Which two DHCPv4 messages are used in lease renewal process?
DHCPREQUEST DHCPACK
A company implements stateless DHCPv6 method for configuring IPv6 addresses on employee workstations. After workstation receives messages from multiple DHCPv6 servers to indicate their availability for DHCPv6 service, which message does it send to server for configuration information?
DHCPv6 INFORMATION-REQUEST
Network engineer is configuring LAN with redundant first hop to make better use of available network resources. Which protocol should engineer implement?
GLBP
A network administrator is overseeing the implementation of first hop redundancy protocols. Which two protocols are Cisco proprietary?
GLBP HSRP
A user needs to add redundancy to the routers in a company. What are the three options the user can use?
GLBP HSRP VRRP
A network administrator is analyzing the features that are supported by different first-hop router redundancy protocols. Which statement is a feature that is associated with GLBP?
GLBP allows load balancing between routers.
What is a potential disadvantage when implementing HSRP as compared to GLBP?
HSRP does not provide load balancing with multiple active routers.
What message informs IPv6 enabled interfaces to use stateful DHCPv6 for obtaining IPv6 address?
ICMPv6 Router Advertisement
When first hop redundancy protocols are used, which two items will be shared by a set of routers that are presenting the illusion of being a single router?
IP address MAC address
A client is using SLAAC to obtain IPv6 address for its interface. After address has been generated and applied to interface, what must client do before it can begin to use this IPv6 address?
It must send ICMPv6 Neighbor Solicitation message to ensure that address is not already in use on network.
Which statement describes a characteristic of GLBP?
It provides automatic rerouting if any router in group fails.
What is the purpose of HSRP?
It provides continuous network connection when router fails.
How does IPv6 client ensure that it has unique address after it configures its IPv6 address using SLAAC allocation method?
It sends ICMPv6 Neighbor Solicitation message with IPv6 address as target IPv6 address.
A network administrator is analyzing first-hop router redundancy protocols. What is a characteristic of VRRPv3?
It supports IPv6 and IPv4 addressing.
Which address type is automatically created by default on host interface when no RAs are received?
Link-local address
What M flag setting indicates that stateful DHCPv6 is used?
M = 1
Which is a characteristic of HSRP learn state?
Router has not determined virtual IP address
Which ICMPv6 message is sent by host in an attempt to locate online IPv6 enabled router to obtain IPv6 addressing information?
Router solicitation (RS)
In which alternative to DHCPv6 does a router dynamically provide IPv6 configuration information to hosts?
SLAAC
Which method best describes stateless DHCP?
SLAAC with stateless DHCPv6 Server
What DHCPv6 message does a host send to look for a DHCPv6 server?
SOLICIT
IPv6-enabled router is to acquire its IPv6 GUA from DHCPv6 server. Which interface configuration command should be configured on client router? Which command should be configured on router interface to set router as stateful DHCPv6 client?
ipv6 address dhcp
Which command is configured on client LAN interface of DHCPv6 relay agent?
ipv6 dhcp relay destination
What is the reason why DHCPREQUEST message is sent as broadcast during DHCPv4 process?
to notify other DHCP servers on subnet that IP address was leased
What device presents illusion of single router to hosts on LAN segment but actually represents set of routers working together? In FHRP terminology, what represents a set of routers that present illusion of single router to hosts?
virtual router
What are two characteristics of SLAAC method for IPv6 address configuration?
IPv6 addressing is dynamically assigned to clients through use of ICMPv6. Default gateway of IPv6 client on LAN will be link-local address of router interface attached to LAN.
What is the most likely scenario in which WAN interface of router would be configured as DHCP client to be assigned dynamic IP address from ISP?
It is a SOHO or home broadband router.
A network administrator is entering the command ipv6 unicast-routing to start configuring DHCPv6 operation on a router. Which statement describes the function of this command?
It is required for sending ICMPv6 RA messages.
What DHCPv6 message does a host send to the DHCPv6 server if it is using stateful DHCPv6?
REQUEST
Which two ICMPv6 messages are used in the SLAAC process?
Router Advertisements (RA) Router solicitation (RS)
During which HSRP state does an interface begin sending periodic hello messages?
Speak
Under which two circumstances would router usually be configured as DHCPv4 client?
This is ISP requirement. Router is intended to be used as SOHO gateway
Which two protocols provide gateway redundancy at Layer 3?
VRRP HSRP
Which command is not configured in stateless DHCPv6?
address prefix ipv6-address/prefix
Which address does DHCPv4 server target when sending DHCPOFFER message to client that makes address request?
client hardware address
Administrator issues the commands: Router(config)# interface g0/1 Router(config-if)# ip address dhcp What is administrator trying to achieve?
configuring router to obtain IP parameters from DHCPv4 server
What type of device routes traffic destined to network segments beyond source network segment for which sending node may not have explicit routing information?
default gateway
If more than one DHCP server is available on the local network, in which order will DHCP messages be sent between a host and a DHCP server?
discover, offer, request, acknowledgment
Which is DHCPv4 address allocation method that assigns IPv4 addresses for limited lease period?
dynamic allocation
IPv6-enabled router is to acquire its IPv6 GUA from another IPv6 router using SLAAC. Which interface configuration command should be configured on client router?
ipv6 address autoconfig
Router is used to provide DHCPv6 server services. Which command should be configured on client facing interface?
ipv6 dhcp server POOL-NAME
Which command must be configured on a router to enable it to join the IPv6 all-routers multicast address ff02::2?
ipv6 unicast-routing
What two methods can be used to generate interface ID by IPv6 host that is using SLAAC?
random generation EUI-64
Which method would IPv6-enabled host using SLAAC employ to learn address of default gateway?
router advertisements that are received from link router
Which DHCPv6 verification command would display link-local and GUA assigned address for each active client?
show ipv6 dhcp binding
What UDP port do DHCPv6 clients use to send DHCPv6 messages?
547
What are the flag settings when host should use SLAAC only option?
A=1, M=0, O=0
What flag settings combination is used for stateless DHCP?
A=1, M=0, O=1
When client is requesting initial address lease from DHCP server, why is DHCPREQUEST message sent as broadcast?
Client may have received offers from multiple servers, and broadcast serves to implicitly decline those other offers.
After booting, client receives ICMPv6 RA message with M flag set to 0 and O flag set to 1. What does this indicate?
Client should automatically configure IPv6 address and then contact DHCPv6 server for more information.
As DHCPv4 client lease is about to expire, what is the message that client sends DHCP server?
DHCPREQUEST
Which three DHCPv6 roles can a router perform?
DHCPv6 client DHCPv6 relay agent DHCPv6 server
Which destination IP address is used when IPv6 host sends DHCPv6 SOLICIT message to locate DHCPv6 server?
FF02::1:2
If a router with a higher HSRP priority joins the network, it will take over the active router roll from an existing active router which has a lower priority.
False
What device that is part of virtual router group assigned to the role of default gateway?
Forwarding router
Which FHRPs are Cisco-proprietary?
HSRP HSRP for IPv6
What device is part of a virtual router group assigned the role of alternate default gateway?
standby router
Which nonproprietary protocol provides router redundancy for a group of routers which support IPv4 LANs?
VRRPv2
