CNA 150 Cisco II - Modules 8 & 9

GLBP

A network engineer is configuring a LAN with a redundant first hop to make better use of the available network resources. Which protocol should the engineer implement? FHRP GLBP HSRP VRRP

The DHCPv6 client router needs to have ipv6 unicast-routing enabled.

Define Step 1 in configuring a Stateless DHCPv6 client.

M flag

This is the Managed Address Configuration flag. Use a stateful DHCPv6 server to obtain an IPv6 GUA.

ipv6 unicast-routing

To enable the sending of RA messages, a router must join the IPv6 all-routers group using the ____________________ global config command, as show in the output.

ipv6 dhcp server POOL-NAME

A router is to provide DHCPv6 server services. Which command should be configured on the client facing interface? ipv6 enable ipv6 dhcp pool POOL-NAME ipv6 dhcp server POOL-NAME ipv6 nd other-config-flag

HSRP VRRP GLBP

A user needs to add redundancy to the routers in a company. What are the three options the user can use? (Choose three.) HSRP VRRP STP IPFIX RAID GLBP

What method is used by a host to verify an IPv6 address is unique on the local network before assigning that address to an interface? ARP DAD PING SLAAC

DAD

The client router needs to have a link-local address. An IPv6 link-local address is created on a router interface when a global unicast address is configured. It can also be created without a GUA using the ipv6 enable interface configuration command. Cisco IOS uses EUI-64 to create a randomized Interface ID. In the output, the ipv6 enable command is configured on the Gigabit Ethernet 0/0/1 interface of the R3 client router.

Define Step 2 in configuring a Stateless DHCPv6 client.

This enters DHCPv6 pool sub-configuration mode as identified by the Router(config-dhcpv6)# prompt.

Define Step 2 in configuring a Stateless DHCPv6 server.

The client router needs to be configured to use SLAAC to create an IPv6 configuration. The ipv6 address autoconfig command enables the automatic configuration of IPv6 addressing using SLAAC.

Define Step 3 in configuring a Stateless DHCPv6 client.

R1 will be configured to provide additional DHCP information including DNS server address and domain name, as shown in the command output.

Define Step 3 in configuring a Stateless DHCPv6 server.

SLAAC

In which alternative to DHCPv6 does a router dynamically provide IPv6 configuration information to hosts? ARP EUI-64 ICMPv6 SLAAC

The 64-bit interface ID is randomly generated by the client operating system. This is the method now used by Windows 10 hosts.

Randomly generated ID.

ipv6 nd managed-config-flag

Stateful DHCPv6 is enabled on a router interface using the ____________________ interface configuration command. This sets the M flag to 1.

ipv6 nd other-config-flag

Stateless DHCPv6 is enabled on a router interface using the ____________________ interface configuration command. This sets the O flag to 1.

Step 1. The standby router stops seeing Hello messages from the forwarding router. Step 2. The standby router assumes the role of the forwarding router. Step 3. Because the new forwarding router assumes both the IPv4 and MAC addresses of the virtual router, the host devices see no disruption in service.

Steps for Router Failover

verify if a router is enabled for SLAAC

What is being shown in the example?

ss

The address pool of a DHCP server is configured with 10.7.30.0/24. The network administrator reserves 5 IP addresses for printers. How many IP addresses are left in the pool to be assigned to other hosts? 253 239 249 250 247

show ipv6 interface

The output of the ____________________ command displays the current settings on an interface.

SOLICIT

What DHCPv6 message does a host send to look for a DHCPv6 server? ADVERTISE SOLICIT INFORMATION-REQUEST REQUEST

REQUEST

What DHCPv6 message does a host send to the DHCPv6 server if it is using stateful DHCPv6? ADVERTISE SOLICIT INFORMATION-REQUEST REQUEST

M=1

What M flag setting indicates that stateful DHCPv6 is used? M=0 M=1

Step 1 - The host sends an RS message. Step 2 - The router responds with an RA message. Step 3 - The host sends a DHCPv6 SOLICIT message. Step 4 - The DHCPv6 server responds with an ADVERTISE message. Step 5 - The host responds to the DHCPv6 server. Step 6 - The DHCPv6 server sends a REPLY message.

What is the correct order of operation steps? The DHCPv6 server responds with an ADVERTISE message. The router responds with an RA message. The host sends an RS message. The host responds to the DHCPv6 server. The DHCPv6 server sends a REPLY message. The host sends a DHCPv6 SOLICIT message.

100

What is the default HSRP priority? 50 100 150 255

the ICMPv6 Router Advertisement

What message informs IPv6 enabled interfaces to use stateful DHCPv6 for obtaining an IPv6 address? the ICMPv6 Router Advertisement the ICMPv6 Router Solicitation the DHCPv6 Reply message the DHCPv6 Advertise message

IP address MAC address

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? (Choose two.) hostname IP address BID static route MAC address

Step 4. One or more DHCPv6 servers respond with a DHCPv6 ADVERTISE unicast message. The ADVERTISE message informs the DHCPv6 client that the server is available for DHCPv6 service.

Which SLAAC operations step is shown in the picture?

DHCPv6 client DHCPv6 relay agent DHCPv6 server

Which three DHCPv6 roles can a router perform? (Choose all that apply.) DHCPv6 client DHCPv6 relay agent DHCPv6 server

Router Solicitation (RS) Router Advertisements (RA)

Which two ICMPv6 messages are used in the SLAAC process? (Choose two.) Neighbor Advertisements (NA) Neighbor Solicitation (NS) Router Solicitation (RS) Router Advertisements (RA)

VRRP HSRP

Which two protocols provide gateway redundancy at Layer 3? (Choose two.) VRRP STP PVST RSTP HSRP

HSRP

____________________ is a Cisco-proprietary FHRP designed to allow for transparent failover of a first-hop IP device.

Step 1. Enable IPv6 routing.

ipv6 unicast-routing

It must send an ICMPv6 Neighbor Solicitation message to ensure that the address is not already in use on the network.

A client is using SLAAC to obtain an IPv6 address for its interface. After an address has been generated and applied to the interface, what must the client do before it can begin to use this IPv6 address? It must send a DHCPv6 INFORMATION-REQUEST message to request the address of the DNS server. It must send an ICMPv6 Router Solicitation message to determine what default gateway it should use. It must send a DHCPv6 REQUEST message to the DHCPv6 server to request permission to use this address. It must send an ICMPv6 Neighbor Solicitation message to ensure that the address is not already in use on the network.

HSRP GLBP

A network administrator is overseeing the implementation of first hop redundancy protocols. Which two protocols are Cisco proprietary? (Choose two.) HSRP VRRP GLBP IRDP VRRPv2

Use the show ipv6 interface brief command to verify the host configuration as shown. The output confirms that the G0/0/1 interface on R3 was assigned a valid GUA.

Define Step 4 in configuring a Stateless DHCPv6 client.

To verify stateless DHCP on a Windows host, use the ipconfig /all command. The example output displays the settings on PC1. Notice in the output that PC1 created its IPv6 GUA using the 2001:db8:acad:1::/64 prefix. Also notice that the default gateway is the IPv6 link-local address of R1. This confirms that PC1 derived its IPv6 configuration from the RA of R1. The highlighted output confirms that PC1 has learned the domain name and DNS server address information from the stateless DHCPv6 server.

Define Step 4 in configuring a Stateless DHCPv6 server.

virtual router

In FHRP terminology, what represents a set of routers that present the illusion of a single router to hosts? standby router virtual router forwarding router default gateway

HSRP HSRP for IPv6

Which FHRPs are Cisco-proprietary? (Choose two.) IRDP HSRP HSRP for IPv6 VRRPv2

Router Solicitation (RS)

Which ICMPv6 message is sent by a host in an attempt to locate an online IPv6enabled router to obtain IPv6 addressing information? Neighbor Advertisements (NA) Neighbor Solicitation (NS) Router Solicitation (RS) Router Advertisements (RA)

Step 1. PC1 sends an RS message to all IPv6-enabled routers.

Which SLAAC operations step is shown in the picture?

Step 2. R1 receives the RS and responds with an RA indicating that the client is to initiate communication with a DHCPv6 server.

Which SLAAC operations step is shown in the picture?

A flag

This is the Address Autoconfiguration flag. Use Stateless Address Autoconfiguration (SLAAC) to create an IPv6 GUA.

O flag

This is the Other Configuration flag. Other information is available from a stateless DHCPv6 server.

False

True or False? 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. True False

A=1, M=0, O=0

What are the flag settings when a host should use the SLAAC only option? A=1, M=0, O=0 A=1, M=1, O=0 A=1, M=0, O=1 A=0, M=1, O=1

The default gateway of an IPv6 client on a LAN will be the link-local address of the router interface attached to the LAN. IPv6 addressing is dynamically assigned to clients through the use of ICMPv6.

What are two characteristics of the SLAAC method for IPv6 address configuration? (Choose two.) The default gateway of an IPv6 client on a LAN will be the link-local address of the router interface attached to the LAN. This stateful method of acquiring an IPv6 address requires at least one DHCPv6 server. Clients send router advertisement messages to routers to request IPv6 addressing. IPv6 addressing is dynamically assigned to clients through the use of ICMPv6. Router solicitation messages are sent by the router to offer IPv6 addressing to clients.

standby router

What device is part of a virtual router group assigned the role of alternate default gateway? virtual router standby router default gateway Layer 3 switch

virtual router

What device presents the illusion of a single router to hosts on a LAN segment but actually represents a set of routers working together? virtual router forwarding router default gateway Layer 3 switch

forwarding router

What device that is part of a virtual router group assigned to the role of default gateway? virtual router forwarding router default gateway Layer 3 switch

HSRP does not provide load balancing with multiple active routers.

What is a potential disadvantage when implementing HSRP as compared to GLBP? HSRP does not function in a multivendor environment. HSRP does not provide load balancing with multiple active routers. HSRP does not have the capability to support IPv6 addresses. HSRP provides default gateway failover only when the active router fails.

Step 3. The client, now a DHCPv6 client, needs to locate a DHCPv6 server and sends a DHCPv6 SOLICIT message to the reserved IPv6 multicast all-DHCPv6-servers address of ff02::1:2. This multicast address has link-local scope, which means routers do not forward the messages to other networks.

Which SLAAC operations step is shown in the picture?

Step 5. The PC1 response depends on whether it is using stateful or stateless DHCPv6: Stateless DHCPv6 client - The client creates an IPv6 address using the prefix in the RA message and a self-generated Interface ID. The client then sends a DHCPv6 INFORMATION-REQUEST message to the DHCPv6 server requesting additional configuration parameters (e.g., DNS server address). Stateful DHCPv6 client - The client sends a DHCPv6 REQUEST message to the DHCPv6 server to obtain all necessary IPv6 configuration parameters.

Which SLAAC operations step is shown in the picture?

link-local address

Which address type is automatically created by default on a host interface when no RAs are received? global unicast address link-local address MAC address

It is required for sending ICMPv6 RA messages.

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. It is required to configure stateful DHCPv6 server on the router. It is required to configure stateless DHCPv6 server on the router. It is required for enabling DNS service in DHCPv6 configurations.

It sends an ICMPv6 Neighbor Solicitation message with the IPv6 address as the target IPv6 address.

How does an IPv6 client ensure that it has a unique address after it configures its IPv6 address using the SLAAC allocation method? It sends an ARP message with the IPv6 address as the destination IPv6 address. It checks with the IPv6 address database that is hosted by the SLAAC server. It contacts the DHCPv6 server via a special formed ICMPv6 message. It sends an ICMPv6 Neighbor Solicitation message with the IPv6 address as the target IPv6 address.

It provides a continuous network connection when a router fails.

What is the purpose of HSRP? It provides a continuous network connection when a router fails. It prevents a rogue switch from becoming the STP root. It enables an access port to immediately transition to the forwarding state. It prevents malicious hosts from connecting to trunk ports.

DAD

What process is used in ICMPv6 for a host to verify that an IPv6 address is unique before configuring it on an interface? DAD SLAAC EUI-64 ARP

EUI-64 random generation

What two methods can be used to generate an interface ID by an IPv6 host that is using SLAAC? (Choose two.) EUI-64 random generation stateful DHCPv6 DAD ARP

default gateway

What type of device routes traffic destined to network segments beyond the source network segment for which the sending node may not have explicit routing information? virtual router standby router default gateway Layer 3 switch

SLAAC with stateless DHCPv6 Server

Which method best describes stateless DHCP? SLAAC only SLAAC with stateless DHCPv6 Server Stateful DHCPv6 Server

router advertisements that are received from the link router

Which method would an IPv6-enabled host using SLAAC employ to learn the address of the default gateway? router advertisements that are received from the link router advertise messages that are received from the DHCPv6 server neighbor advertisements that are eceived from link neighbors reply messages that are received from the DHCPv6 server

VRRPv2

Which nonproprietary protocol provides router redundancy for a group of routers which support IPv4 LANs? HSRP VRRPv2 GLBP SLB

547

What UDP port do DHCPv6 clients use to send DHCPv6 messages? 67 68 546 547

DHCPv6 INFORMATION-REQUEST

A company implements the stateless DHCPv6 method for configuring IPv6 addresses on employee workstations. After a workstation receives messages from multiple DHCPv6 servers to indicate their availability for DHCPv6 service, which message does it send to a server for configuration information? DHCPv6 SOLICIT DHCPv6 REQUEST DHCPv6 ADVERTISE DHCPv6 INFORMATION-REQUEST

It supports IPv6 and IPv4 addressing.

A network administrator is analyzing first-hop router redundancy protocols. What is a characteristic of VRRPv3? VRRPv3 is Cisco proprietary. It supports IPv6 and IPv4 addressing. It works together with HSRP. It allows load balancing between routers.

GLBP allows load balancing between routers.

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. It is nonproprietary. It uses a virtual router master. It works together with VRRP.

The client should automatically configure an IPv6 address and then contact a DHCPv6 server for more information.

After booting, a client receives an ICMPv6 RA message with the M flag set to 0 and the O flag set to 1. What does this indicate? The client should request an IPv6 address directly from a DHCPv6 server. The client should automatically configure an IPv6 address without contacting a DHCPv6 server. The client should automatically configure an IPv6 address and then contact a DHCPv6 server for more information. The client should be statically configured with an IPv6 address because the local router does not support autoconfiguration.

200

An IPv6-enabled Cisco router sends RA messages to the IPv6 all-nodes multicast address ff02::1 every ____________________ seconds.

ipv6 address dhcp

An IPv6-enabled router is to acquire its IPv6 GUA from a DHCPv6 server. Which interface configuration command should be configured on client router? ipv6 address autoconfig ipv6 address auto config ipv6 address dhcp ipv6 address dhcpv6

ipv6 address autoconfig

An IPv6-enabled router is to acquire its IPv6 GUA from another IPv6 router using SLAAC. Which interface configuration command should be configured on the client router? ipv6 address autoconfig ipv6 address auto config ipv6 address dhcp ipv6 address dhcpv6

The DHCPv6 pool has to be bound to the interface using the ipv6 dhcp server POOL-NAME interface config command as shown in the output. The router responds to stateless DHCPv6 requests on this interface with the information contained in the pool. The O flag needs to be manually changed from 0 to 1 using the interface command ipv6 nd other-config-flag. RA messages sent on this interface indicate that additional information is available from a stateless DHCPv6 server. The A flag is 1 by default, telling clients to use SLAAC to create their own GUA.

Define Step 4 in configuring a Stateless DHCPv6 server.

The show ipv6 dhcp interface g0/0/1 command confirms that the DNS and domain names were also learned by R3.

Define Step 5 in configuring a Stateless DHCPv6 client.

speak

During which HSRP state does an interface begin sending periodic hello messages? initial listen speak active

The host creates an interface ID using its 48-bit MAC address and inserts the hex value of fffe in the middle of the address. Some operating systems default to the randomly generated interface ID instead of the EUI-64 method, due to privacy concerns. This is because the Ethernet MAC address of the host is used by EUI-64 to create the interface ID.

EUI-64 ID

Step 1. Enable IPv6 routing. Step 2. Define a DHCPv6 pool name. Step 3. Configure the DHCPv6 pool. Step 4. Bind the DHCPv6 pool to an interface. Step 5. Verify that the hosts have received IPv6 addressing information.

There are five steps to configure and verify a router as a stateless DHCPv6 server: Define a DHCPv6 pool name. Bind the DHCPv6 pool to an interface. Enable IPv6 routing. Verify that the hosts have received IPv6 addressing information. Configure the DHCPv6 pool.

A=1, M=0, O=1

What flag settings combination is used for stateless DHCP? A=1, M=0, O=0 A=0, M=1, O=0 A=1, M=0, O=1 A=0, M=1, O=1

FF02::1:2

Which destination IP address is used when an IPv6 host sends a DHCPv6 SOLICIT message to locate a DHCPv6 server? FF02::1:2 FF02::1 FE80::1 FF02::2

the router has not determined the virtual IP address

Which is a characteristic of the HSRP learn state? the router has not determined the virtual IP address the router knows the virtual IP address the router sends periodic hello messages the router actively participates in the active/standby election process

ipv6 dhcp relay destination

Which command is configured on the client LAN interface of the DHCPv6 relay agent? ip helper-address ipv6 dhcp relay destination ipv6 enable ipv6 helper-address

address prefix ipv6-address/prefix

Which command is not configured in stateless DHCPv6? address prefix ipv6-address/prefix domain-name name dns-server server-address ipv6 dhcp server pool-name

> ipv6 unicast-routing

Which command must be configured on a router to enable it to join the IPv6 all-routers multicast address ff02::2? ip routing ipv6 unicast-routing ipv6 address ipv6-address/prefix-length ipv6 address ipv6-address link-local

>ipv6 address dhcp

Which command should be configured on a router interface to set the router as a stateful DHCPv6 client? ipv6 enable ipv6 address dhcp ipv6 address autoconfigure ipv6 dhcp server stateful

It provides automatic rerouting if any router in the group fails.

Which statement describes a characteristic of GLBP? It does not provide support for IPv6.​ It provides load balancing for a maximum of four gateways. It provides multiple virtual IP addresses and multiple virtual MAC addresses. It provides automatic rerouting if any router in the group fails.

show ipv6 dhcp binding

Which DHCPv6 verification command would display the link-local and GUA assigned address for each active client? show ip dhcp pool show ipv6 dhcp binding show ipv6 dhcp interface show ipv6 dhcp pool

Step 6. The server sends a DHCPv6 REPLY unicast message to the client. The content of the message varies depending on if it is replying to a REQUEST or INFORMATION-REQUEST message. Note: The client will use the source IPv6 Link-local address of the RA as its default gateway address. A DHCPv6 server does not provide this information.

Which SLAAC operations step is shown in the picture?