COMMS_SA2

DHCPOFFER

a DHCP server responding to the initial request by a client

DHCPACK Explanation: When a host uses DHCP to automatically configure an IP address, the typically sends two messages: the DHCPDISCOVER message and the DHCPREQUEST message. These two messages are usually sent as broadcasts to ensure that all DHCP servers receive them. The servers respond to these messages using DHCPOFFER, DHCPACK, and DHCPNACK messages, depending on the circumstance.

A host PC is attempting to lease an address through DHCP. What message is sent by the server to let the client know it is able to use the provided IP information? DHCPDISCOVER DHCPOFFER DHCPREQUEST DHCPACK DHCPNACK

R1(config-if)# ip address 192.168.1.100 255.255.255.0 R1(config-if)# standby 1 ip 192.168.1.1 R1(config-if)# standby 1 priority 255 R1(config-if)# standby 1 preempt R1(config-if)# no shutdown In order to configure HSRP, the standby command is used. The IP address given with the standby command is the virtual IP address used by hosts as a default gateway. A priority number of 255 is the highest that can be assigned and should be configured on the router that is to be the active router.

A network administrator would like to ensure that router R1 is always elected the active router for an HSRP group. Which set of commands would ensure the required results? R1(config-if)# ip address 192.168.1.250 255.255.255.0 R1(config-if)# standby 1 ip 192.168.1.1 R1(config-if)# no shutdown R1(config-if)# ip address 192.168.1.100 255.255.255.0 R1(config-if)# standby 1 ip 192.168.1.1 R1(config-if)# standby 1 priority 255 R1(config-if)# standby 1 preempt R1(config-if)# no shutdown R1(config-if)# ip address 192.168.1.100 255.255.255.0 R1(config-if)# standby 1 ip 192.168.1.1 R1(config-if)# standby 1 priority 1 R1(config-if)# no shutdown R1(config-if)# ip address 192.168.1.100 255.255.255.0 R1(config-if)# standby 1 ip 192.168.1.1 R1(config-if)# standby 1 priority 150 R1(config-if)# no shutdown

DHCPDISCOVER - a client initiating a message to find a DHCP server DHCPOFFER - a DHCP server responding to the initial request by a client DHCPREQUEST - the client accepting the IP address provided by the DHCP server DHCPACK - the DHCP server confirming that the lease has been accepted

Place the options in the following order: a client initiating a message to find a DHCP server - DHCPDISCOVER a DHCP server responding to the initial request by a client - DHCPOFFER the client accepting the IP address provided by the DHCP server - DHCPREQUEST the DHCP server confirming that the lease has been accepted - DHCPACK

GLBP Explanation: GLBP, or Group Load Balancing Protocol, allows multiple routers to act as a single default gateway for hosts. GLBP load balances the traffic across the individual routers on a per host basis.

Refer to the exhibit. What protocol can be configured on gateway routers R1 and R2 that will allow traffic from the internal LAN to be load balanced across the two gateways to the Internet? GLBP PVST+ PVST STP

DHCPREQUEST Explanation: When the client receives the DHCPOFFER from the server, it sends back a DHCPREQUEST broadcast message. On receiving the DHCPREQUEST message, the server replies with a unicast DHCPACK message.

Which message does an IPv4 host use to reply when it receives a DHCPOFFER message from a DHCP server? DHCPOFFER DHCPDISCOVER DHCPREQUEST DHCPACK

a DHCPREQUEST unicast message​ Explanation: When the IP address lease time of the DHCP client expires, it sends a DHCPREQUEST unicast message directly to the DHCPv4 server that originally offered the IPv4 address.

Which kind of message is sent by a DHCP client when its IP address lease has expired?​ a DHCPDISCOVER unicast message​ a DHCPREQUEST broadcast message​ a DHCPREQUEST unicast message​ a DHCPDISCOVER broadcast message

FastEthernet ports 5 through 10 can receive up to 6 DHCP discovery messages per second. Explanation: When DHCP snooping is being configured, the number of DHCP discovery messages that untrusted ports can receive per second should be rate-limited by using the ip dhcp snooping limit rate interface configuration command. When a port receives more messages than the rate allows, the extra messages will be dropped.

A network administrator enters the following commands on the switch SW1. SW1(config)# interface range fa0/5 - 10 SW1(config-if)# ip dhcp snooping limit rate 6 What is the effect after these commands are entered? If any of the FastEthernet ports 5 through 10 receive more than 6 DHCP messages per second, the port will be shut down. FastEthernet ports 5 through 10 can receive up to 6 DHCP messages per second of any type. If any of the FastEthernet ports 5 through 10 receive more than 6 DHCP messages per second, the port will continue to operate and an error message will be sent to the network administrator. FastEthernet ports 5 through 10 can receive up to 6 DHCP discovery messages per second.

It checks the source MAC address in the Ethernet header against the sender MAC address in the ARP body. Explanation: DAI can be configured to check for both destination or source MAC and IP addresses: Destination MAC - Checks the destination MAC address in the Ethernet header against the target MAC address in the ARP body. Source MAC - Checks the source MAC address in the Ethernet header against the sender MAC address in the ARP body. IP address - Checks the ARP body for invalid and unexpected IP addresses including addresses 0.0.0.0, 255.255.255.255, and all IP multicast addresses.

A network administrator is configuring DAI on a switch with the command ip arp inspection validate src-mac . What is the purpose of this configuration command? It checks the source MAC address in the Ethernet header against the user-configured ARP ACLs. It checks the source MAC address in the Ethernet header against the MAC address table. It checks the source MAC address in the Ethernet header against the sender MAC address in the ARP body. It checks the source MAC address in the Ethernet header against the target MAC address in the ARP body.

SW2(config-if-range)# channel-group 1 mode active* The possible combinations to establish an EtherChannel between SW1 and SW2 using LACP or PAgP are as follows:PAgPon onauto desirabledesirable desirable LACPon onactive activepassive active The EtherChannel mode chosen on each side of the EtherChannel must be compatible in order to enable it.

A network administrator is configuring an EtherChannel link between switches SW1 and SW2 by using the command SW1(config-if-range)# channel-group 1 mode passive. Which command must be used on SW2 to enable this EtherChannel? SW2(config-if-range)# channel-group 1 mode desirable SW2(config-if-range)# channel-group 1 mode auto SW2(config-if-range)# channel-group 1 mode passive SW2(config-if-range)# channel-group 1 mode active*

B. configuring the router to obtain IP parameters from a DHCPv4 server

An administrator issues the commands: Router(config)# interface g0/1 Router(config-if)# ip address dhcp What is the administrator trying to achieve? A. configuring the router to act as a DHCPv4 server B. configuring the router to obtain IP parameters from a DHCPv4 server C. configuring the router to act as a relay agent D. configuring the router to resolve IP address conflicts

Explanation: The broadcast DHCPDISCOVER message finds DHCPv4 servers on the network. When the DHCPv4 server receives a DHCPDISCOVER message, it reserves an available IPv4 address to lease to the client and sends the unicast DHCPOFFER message to the requesting client. When the client receives the DHCPOFFER from the server, it sends back a DHCPREQUEST. On receiving the DHCPREQUEST message the server replies with a unicast DHCPACK message. DHCPREPLY and DHCPINFORMATION-REQUEST are DHCPv6 messages.

Match the DHCP message types to the order of the DHCPv4 process. (Not all options are used.) Step 1 DHCPDISCOVER Step 2 DHCPOFFER Step 3 DHCPREQUEST Step 4 DHCPACK

DHCPDISCOVER -> DHCPOFFER -> DHCPREQUEST -> DHCPACK DHCPDISCOVER (first) DHCPOFFER (second) DHCPREQUEST (third) DHCPACK (fourth)

Order the DHCP message types as they would occur between a DHCP client and a DHCP server. The DHCPDISCOVER message is used to identify any DHCP servers on a network. The DHCPOFFER message is used by a server to offer a lease to a client. The DHCPREQUEST message is used to identify both the specific DHCP server and the lease that the client is accepting. The DHCPACK message is used by a server to finalize a successful lease with a client. The DHCPNAK message is used when an offered lease is no longer valid.

the virtual IP address and the virtual MAC address for the HSRP group 1* Hosts will send an ARP request to the default gateway which is the virtual IP address. ARP replies from the HSRP routers contain the virtual MAC address. The host ARP tables will contain a mapping of the virtual IP to the virtual MAC.

Refer to the exhibit. A network administrator configured routers R1 and R2 as part of HSRP group 1. After the routers have been reloaded, a user on Host1 complained of lack of connectivity to the Internet The network administrator issued the show standby brief command on both routers to verify the HSRP operations. In addition, the administrator observed the ARP table on Host1. Which entry should be seen in the ARP table on Host1 in order to gain connectivity to the Internet? the virtual IP address of the HSRP group 1 and the MAC address of R1 the virtual IP address of the HSRP group 1 and the MAC address of R2 the virtual IP address and the virtual MAC address for the HSRP group 1* the IP address and the MAC address of R1

One of the ports on S2 was not configured correctly.* The EtherChannel bundle is not working.* In order to form an EtherChannel, all ports should be within the same group.

Refer to the exhibit. A network administrator has decided that an EtherChannel between ports 0/1 and 0/2 on switches S1 and S2 would help performance. After making the configuration, the administrator notices no performance gain. Based on the output that is shown, what two possible assumptions could a network administrator make? (Choose two.) Switch S2 did not use a compatible EtherChannel mode. The EtherChannel bundle is working. One of the ports on S2 was not configured correctly.* LACP and PAgP were both used to form the EtherChannel. The EtherChannel bundle is not working.* Switch S2 must be configured so that the maximum number of port channels is increased.

The state is not maintained by the DHCPv6 server under stateless DHCPv6 operation. Explain:Under the stateless DHCPv6 configuration, indicated by the command ipv6 nd other-config-flag, the DHCPv6 server does not maintain the state information, because client IPv6 addresses are not managed by the DHCP server. Because the clients will configure their IPv6 addresses by combining the prefix/prefix-length and a self-generated interface ID, the ipv6 dhcp pool configuration does not need to specify the valid IPv6 address range. And because clients will use the link-local address of the router interface as the default gateway address, the default gateway address is not necessary.

Refer to the exhibit. A network administrator is configuring a router as a DHCPv6 server. The administrator issues a show ipv6 dhcp pool command to verify the configuration. Which statement explains the reason that the number of active clients is 0? The default gateway address is not provided in the pool. No clients have communicated with the DHCPv6 server yet. The IPv6 DHCP pool configuration has no IPv6 address range specified. The state is not maintained by the DHCPv6 server under stateless DHCPv6 operation.

The router is configured for stateless DHCPv6 operation. Explanation: The DHCPv6 is for the stateless DHCPv6 operation that is indicated by changing the O flag to 1 and leaving the M flag as default, which is 0. Therefore, it is not configured for stateful DHCPv6 operation. Although the DNS server has the interface ID 0010, clients in stateless DHCPv6 operation will configure their interface IDs either by EUI-64 or a random number. The ACAD_CLASS is the name of the DHCP pool, not the DHCP server name.

Refer to the exhibit. A network administrator is configuring a router for DHCPv6 operation. Which conclusion can be drawn based on the commands? The router is configured for stateful DHCPv6 operation, but the DHCP pool configuration is incomplete. The DHCPv6 server name is ACAD_CLASS. Clients would configure the interface IDs above 0010. The router is configured for stateless DHCPv6 operation.

The router is configured for SLAAC operation. Explanation: The router is configured for SLAAC operation because there is no configuration command to change the RA M and O flag value. By default, both M and O flags are set to 0. In order to permint stateless DHCPv6 operation, the interface command ipv6 nd other-config-flag should be issued. The GigabitEthernet interface is in working condition because clients can get RA messages and configure their IPv6 addresses as expected. Also, the fact that R1 is the DHCPv6 server and clients are getting RA messages indicates that clients can communicate with the DHCP server. The number of active clients is 0 because the DHCPv6 server does not maintain the state of clients IPv6 addresses (it is not configured for stateful DHCPv6 operation). The DNS server address issue is not relevant to the problem.

Refer to the exhibit. A network administrator is implementing the stateless DHCPv6 operation for the company. Clients are configuring IPv6 addresses as expected. However, the clients are not getting the DNS server address and the domain name information configured in the DHCP pool. What could be the cause of the problem? The DNS server address is not on the same network as the clients are on. The router is configured for SLAAC operation. The GigabitEthernet interface is not activated. The clients cannot communicate with the DHCPv6 server, evidenced by the number of active clients being 0.

The EtherChannel is not functional.*

Refer to the exhibit. A network administrator issued the show etherchannel summary command on the switch S1. What conclusion can be drawn? The EtherChannel is not functional.* The EtherChannel is suspended. FastEthernet ports Fa0/1, Fa0/2, and Fa0/3 do not join the EtherChannel. The port aggregation protocol PAgP is misconfigured.

192.168.2.100 Explanation: The host default gateway address should be the FHRP (in this case GLBP) virtual IP address.

Refer to the exhibit. A network engineer is troubleshooting host connectivity on a LAN that uses a first hop redundancy protocol. Which IPv4 gateway address should be configured on the host? 192.168.2.0 192.168.2.1 192.168.2.2 192.168.2.100

192.168.2.100 The host default gateway address should be the FHRP (in this case GLBP) virtual IP address.

Refer to the exhibit. A network engineer is troubleshooting host connectivity on a LAN that uses a first hop redundancy protocol. Which IPv4 gateway address should be configured on the host? 92.168.2.0 192.168.2.1 192.168.2.2 192.168.2.100*

The EtherChannel was not configured with the same allowed range of VLANs on each interface. The guidelines for configuring an EtherChannel link are:Interfaces which form an EtherChannel can be physically discontiguous, and on different modules.Interfaces in an EtherChannel have to operate at the same speed and in the same duplex mode.Interfaces in the EtherChannel must be assigned to the same VLAN, or be configured as a trunk.

Refer to the exhibit. An EtherChannel was configured between switches S1 and S2, but the interfaces do not form an EtherChannel. What is the problem? The switch ports have to be configured as access ports with each port having a VLAN assigned. The interface port-channel number has to be different on each switch. The switch ports were not configured with speed and duplex mode. The EtherChannel was not configured with the same allowed range of VLANs on each interface.

The EtherChannel is in use and functional as indicated by the SU and P flags in the command output. The command output shows the port channel as SU, which means Layer 2 and in use; and the FastEthernet 0/10 and 0/11 interfaces are bundled in port-channel as indicated by the P flag. Configuring the EtherChannel using the channel-group 1 mode on command will cause the Protocol field in the command output to be empty.

Refer to the exhibit. Based on the command output shown, what is the status of the EtherChannel? The EtherChannel is dynamic and is using ports Fa0/10 and Fa0/11 as passive ports. The EtherChannel is down as evidenced by the protocol field being empty. The EtherChannel is partially functional as indicated by the P flags for the FastEthernet ports. The EtherChannel is in use and functional as indicated by the SU and P flags in the command output.

stateless DHCPv6 Explanation: Stateful DHCPv6 pools are configured with address prefixes for hosts via the address command, whereas stateless DHCPv6 pools typically only contain information such as DNS server addresses and the domain name. RA messages that are sent from routers that are configured as stateful DHCPv6 servers have the M flag set to 1 with the command ipv6 nd managed-config-flag, whereas stateless DHCPv6 servers are indicated by setting the O flag to 1 with the ipv6 nd other-config-flag command.

Refer to the exhibit. Based on the output that is shown, what kind of IPv6 addressing is being configured? stateless DHCPv6 SLAAC static link-local stateful DHCPv6

The ipv6 dhcp relay command should be applied to interface Gig0/0. Explanation: The ipv6 dhcp relay command must be applied to the interface where the clients are located. The ipv6 dhcp relay command can use either the link-local or global unicast address of the DHCPv6 server, or even a multicast address. The ipv6 nd managed-config-flag indicates to the clients that they should use stateful DHCPv6 and is also applied to the interface where the clients are located.

Refer to the exhibit. PC-A is unable to receive an IPv6 address from the stateful DHCPv6 server. What is the problem? The ipv6 dhcp relay command should be applied to interface Gig0/0. The ipv6 nd managed-config-flag should be applied to interface Gig0/1. The ipv6 dhcp relay command should use the link-local address of the DHCP server. The ipv6 nd managed-config-flag command should be ipv6 nd other-config-flag .

7 Explanation: The DHCP snooping configuration includes building the DHCP Snooping Binding Database and assigning necessary trusted ports on switches. A trusted port points to the legitimate DHCP servers. In this network design, because the DHCP server is attached to AS3, seven switch ports should be assigned as trusted ports, one on AS3 toward the DHCP server, one on DS1 toward AS3, one on DS2 toward AS3, and two connections on both AS1 and AS2 (toward DS1 and DS2), for a total of seven.

Refer to the exhibit. PC1 and PC2 should be able to obtain IP address assignments from the DHCP server. How many ports among switches should be assigned as trusted ports as part of the DHCP snooping configuration? 1 3 5 7

255.255.255.255 Explanation: When a host boots and has been configured for dynamic IP addressing, the device tries to obtain a valid IP address. It sends a DHCPDISCOVER message. This is a broadcast message because the DHCP server address is unknown (by design). The destination IP address in the IP header is 255.255.255.255 and the destination MAC address is FF:FF:FF:FF:FF:FF.

Refer to the exhibit. PC1 is configured to obtain a dynamic IP address from the DHCP server. PC1 has been shut down for two weeks. When PC1 boots and tries to request an available IP address, which destination IP address will PC1 place in the IP header? A. 192.168.1.1 B. 192.168.1.255 C. 255.255.255.255 D. 192.168.1.8

SWA(config-if)# switchport port-security SWA(config-if)# switchport port-security maximum 2 SWA(config-if)# switchport port-security mac-address sticky Explanation: The default mode for a port security violation is to shut down the port so the switchport port-security violation command is not necessary. The switchport port-security command must be entered with no additional options to enable port security for the port. Then, additional port security options can be added.

Refer to the exhibit. Port Fa0/2 has already been configured appropriately. The IP phone and PC work properly. Which switch configuration would be most appropriate for port Fa0/2 if the network administrator has the following goals? No one is allowed to disconnect the IP phone or the PC and connect some other wired device.If a different device is connected, port Fa0/2 is shut down.The switch should automatically detect the MAC address of the IP phone and the PC and add those addresses to the running configuration. SWA(config-if)# switchport port-security SWA(config-if)# switchport port-security mac-address sticky SWA(config-if)# switchport port-security SWA(config-if)# switchport port-security maximum 2 SWA(config-if)# switchport port-security mac-address sticky SWA(config-if)# switchport port-security violation restrict SWA(config-if)# switchport port-security mac-address sticky SWA(config-if)# switchport port-security maximum 2 SWA(config-if)# switchport port-security SWA(config-if)# switchport port-security maximum 2 SWA(config-if)# switchport port-security mac-address sticky

Frames from PC1 will cause the interface to shut down immediately, and a log entry will be made. Explanation: Manual configuration of the single allowed MAC address has been entered for port fa0/12. PC1 has a different MAC address and when attached will cause the port to shut down (the default action), a log message to be automatically created, and the violation counter to increment. The default action of shutdown is recommended because the restrict option might fail if an attack is underway.

Refer to the exhibit. Port security has been configured on the Fa 0/12 interface of switch S1. What action will occur when PC1 is attached to switch S1 with the applied configuration? Frames from PC1 will be forwarded since the switchport port-security violation command is missing. Frames from PC1 will be forwarded to its destination, and a log entry will be created. Frames from PC1 will be forwarded to its destination, but a log entry will not be created. Frames from PC1 will cause the interface to shut down immediately, and a log entry will be made. Frames from PC1 will be dropped, and there will be no log of the violation. Frames from PC1 will be dropped, and a log message will be created.

The MAC address of PC1 that connects to the Fa0/2 interface is not the configured MAC address. Explanation: The security violation counter for Fa0/2 has been incremented (evidenced by the 1 in the SecurityViolation column). The most secure addresses allowed on port Fa0/2 is 1 and that address was manually entered. Therefore, PC1 must have a different MAC address than the one configured for port Fa0/2. Connections between end devices and the switch, as well as connections between a router and a switch, are made with a straight-through cable.

Refer to the exhibit. The Fa0/2 interface on switch S1 has been configured with the switchport port-security mac-address 0023.189d.6456 command and a workstation has been connected. What could be the reason that the Fa0/2 interface is shutdown? The Fa0/24 interface of S1 is configured with the same MAC address as the Fa0/2 interface. The connection between S1 and PC1 is via a crossover cable. S1 has been configured with a switchport port-security aging command. The MAC address of PC1 that connects to the Fa0/2 interface is not the configured MAC address.

The port violation mode is the default for any port that has port security enabled. Explanation: The Port Security line simply shows a state of Enabled if the switchport port-security command (with no options) has been entered for a particular switch port. If a port security violation had occurred, a different error message appears such as Secure-shutdown. The maximum number of MAC addresses supported is 50. The Maximum MAC Addresses line is used to show how many MAC addresses can be learned (2 in this case). The Sticky MAC Addresses line shows that only one device has been attached and learned automatically by the switch. This configuration could be used when a port is shared by two cubicle-sharing personnel who bring in separate laptops.

Refer to the exhibit. What can be determined about port security from the information that is shown? The port has the maximum number of MAC addresses that is supported by a Layer 2 switch port which is configured for port security. The port has been shut down. The port violation mode is the default for any port that has port security enabled. The port has two attached devices.

Add the ipv6 dhcp relay command to interface Fa0/0. Explanation: Client DHCPv6 messages are sent to a multicast address with link-local scope, which means that the messages will not be forwarded by routers. Because the client and server are on different subnets on different interfaces, the message will not reach the server. The router can be configured to relay the DHCPv6 messages from the client to the server by configuring the ipv6 dhcp relay command on the interface that is connected to the client.

Refer to the exhibit. What should be done to allow PC-A to receive an IPv6 address from the DHCPv6 server? Add the ipv6 dhcp relay command to interface Fa0/0. Change the ipv6 nd managed-config-flag command to ipv6 nd other-config-flag. Configure the ipv6 nd managed-config-flag command on interface Fa0/1. Add the IPv6 address 2001:DB8:1234:5678::10/64 to the interface configuration of the DHCPv6 server.

The output shows that the active router is local and indicates that this router is the active router and is currently forwarding packets.

Refer to the exhibit. What statement is true about the output of the show standby command? The current priority of this router is 120. This router is tracking two properly operating interfaces. This router is in the HSRP down state because its tracked interfaces are down. The router is currently forwarding packets.*

MAC address of the virtual router Explanation: The IP address of the virtual router acts as the default gateway for all the workstations. Therefore, the MAC address that is returned by the Address Resolution Protocol to the workstation will be the MAC address of the virtual router.

Refer to the exhibit. Which destination MAC address is used when frames are sent from the workstation to the default gateway? MAC address of the virtual router MAC address of the standby router MAC addresses of both the forwarding and standby routers MAC address of the forwarding router

EtherChannel* PortFast is used to reduce the amount of time that a port spends going through the spanning-tree algorithm, so that devices can start sending data sooner. Trunking can be implemented in conjunction with EtherChannel, but trunking alone does not aggregate switch links. HSRP is used to load-balance traffic across two different connections to Layer 3 devices for default gateway redundancy. HSRP does not aggregate links at either Layer 2 or Layer 3 as EtherChannel does.

Refer to the exhibit. Which switching technology would allow each access layer switch link to be aggregated to provide more bandwidth between each Layer 2 switch and the Layer 3 switch? HSRP EtherChannel* trunking PortFast

WiMAX is short for Worldwide Interoperability for Microwave Access. WiMAX is a family of wireless communication standards based on the IEEE 802.16 set of standards. Satellite Internet provides Internet access via satellite. It is a form of wireless broadband technology. But it is usually slower than DSL and cable modem. Municipal wireless network is a city-wide wireless network. This is usually done by providing municipal broadband via Wi-Fi to large parts or all of a municipal area by deploying a wireless mesh network. The typical deployment design uses hundreds of wireless access points deployed outdoors, often on poles. DSLAM (Digital Subscriber Line Access Multiplexer) is a network device, usually at a telephone company central office, that receives signals from multiple customer Digital Subscriber Line (DSL) connections and puts the signals on a high-speed backbone line using multiplexing techniques. It is a cable technology, not a wireless technology. Cable Modem Termination Systems (CMTS) is a piece of equipment, typically located in a cable company's headend or hubsite, which is used to provide high speed data services, such as cable Internet or Voice over Internet Protocol, to cable subscribers. It is a cable technology, not a wireless technology.

What are three broadband wireless technologies? (Choose three) WiMax satellite Internet municipal Wi-Fi

The computer receives an IP address that starts with 169.254. Explanation: When a Windows PC cannot communicate with an IPv4 DHCP server, the computer automatically assigns an IP address in the 169.254.0.0/16 range. Any other device on the same network that receives an address in the same range is reachable.​

What is one indication that a Windows computer did not receive an IPv4 address from a DHCP server? The computer cannot ping 127.0.0.1. The computer receives an IP address that starts with 169.254. Windows displays a DHCP timeout message. The computer cannot ping other devices on the same network with IP addresses in the 169.254.0.0/16 range.

B. DHCPDISCOVER

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 A. DHCPACK B. DHCPDISCOVER C. DHCPOFFER D. DHCPREQUEST

broadcast DHCPREQUEST Explanation: When a DHCP client receives DHCPOFFER messages, it will send a broadcast DHCPREQUEST message for two purposes. First, it indicates to the offering DHCP server that it would like to accept the offer and bind the IP address. Second, it notifies any other responding DHCP servers that their offers are declined.

Which DHCPv4 message will a client send to accept an IPv4 address that is offered by a DHCP server? broadcast DHCPACK broadcast DHCPREQUEST unicast DHCPACK unicast DHCPREQUEST

ip address dhcp Explanation: The ip address dhcp interface configuration command configures an Ethernet interface as a DHCP client. The service dhcp global configuration command enables the DHCPv4 server process on the router. The ip helper-address command is issued to enable DHCP relay on the router. The ip dhcp pool command creates the name of a pool of addresses that the server can assign to hosts.

Which command, when issued in the interface configuration mode of a router, enables the interface to acquire an IPv4 address automatically from an ISP, when that link to the ISP is enabled? service dhcp ip address dhcp ip helper-address ip dhcp pool

ip dhcp excluded-address 192.168.100.1 192.168.100.10 ip dhcp excluded-address 192.168.101.254 ip dhcp pool LAN-POOL-100 network 192.168.100.0 255.255.254.0 default-router 192.168.100.1

Which set of commands will configure a router as a DHCP server that will assign IPv4 addresses to the 192.168.100.0/23 LAN while reserving the first 10 and the last addresses for static assignment? ip dhcp excluded-address 192.168.100.1 192.168.100.9 ip dhcp excluded-address 192.168.101.254 ip dhcp pool LAN-POOL-100 ip network 192.168.100.0 255.255.254.0 ip default-gateway 192.168.100.1 dhcp pool LAN-POOL-100 ip dhcp excluded-address 192.168.100.1 192.168.100.9 ip dhcp excluded-address 192.168.100.254 network 192.168.100.0 255.255.254.0 default-router 192.168.101.1 ip dhcp excluded-address 192.168.100.1 192.168.100.10 ip dhcp excluded-address 192.168.100.254 ip dhcp pool LAN-POOL-100 network 192.168.100.0 255.255.255.0 ip default-gateway 192.168.100.1 ip dhcp excluded-address 192.168.100.1 192.168.100.10 ip dhcp excluded-address 192.168.101.254 ip dhcp pool LAN-POOL-100 network 192.168.100.0 255.255.254.0 default-router 192.168.100.1

learn listen speak Initial This is the beginning state. It indicates HSRP is not running. It happens when the configuration changes or the interface is first turned on Learn The router has not determined the virtual IP address and has not yet seen an authenticated hello message from the active router. In this state, the router still waits to hear from the active router. Listen The router knows both IP and MAC address of the virtual router but it is not the active or standby router. For example, if there are 3 routers in HSRP group, the router which is not in active or standby state will remain in listen state. Speak The router sends periodic HSRP hellos and participates in the election of the active or standby router. Standby In this state, the router monitors hellos from the active router and it will take the active state when the current active router fails (no packets heard from active router) Active The router forwards packets that are sent to the HSRP group. The router also sends periodic hello messages

Which three options are the HSRP states for a router? (Choose three) initialize learn secondary listen speak primary

DHCP Snooping Port Security IP Source Guard (IPSG) - prevents MAC and IP address spoofing attacks Dynamic ARP Inspection (DAI) - prevents ARP spoofing and ARP poisoning attacks DHCP Snooping - prevents DHCP starvation and SHCP spoofing attacks Port Security - prevents many types of attacks including MAC table overflow attacks and DHCP starvation attacks Web Security Appliance (WSA) - is a mitigation technology for web-based threats.

Which two Cisco solutions help prevent DHCP starvation attacks? (Choose two.) DHCP Snooping IP Source Guard Dynamic ARP Inspection Port Security Web Security Appliance

DHCPDISCOVER

a client initiating a message to find a DHCP server

DHCPACK

the DHCP server confirming that the lease has been accepted

DHCPREQUEST

the client accepting the IP address provided by the DHCP server