Module 7-9: Available and Reliable Networks
The address pool of a DHCP server is configured with 172.21.121.0/25. The network administrator reserves 12 IP addresses for web servers. How many IP addresses are left in the pool to be assigned to other hosts?
114
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?
192.168.2.100
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?
255.255.255.255
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
Which protocol automates assignment of IP addresses on a network, and which port number does it use? (Choose two.)
DHCP 67
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?
DHCP ACK
Match each DHCP message type with its description
DHCP DISCOVER - a client initiating a message to find a DHCP server DHCP OFFER - a DHCP server responding to the initial request by a client DHCP REQUEST - the client accepting the IP address provided by the DHCP server DHCP ACK - the DHCP server confirming that the address lease has been accepted
Which message does an IPv4 host use to reply when it receives a DHCPOFFER message from a DHCP server?
DHCP REQUEST
Match the purpose with its DHCP message type
DHCP REQUEST - a message that is used to identify the explicit server and lease offer to accept DHCP DISCOVER - a message that is used to locate any available DHCP server on a network DHCP OFFER - a message that is used to suggest a lease to a client DHCP ACK - a message that is used to acknowledge that the lease is successful
A company uses DHCP servers to dynamically assign IPv4 addresses to employee workstations. The address lease duration is set as 5 days. An employee returns to the office after an absence of one week. When the employee boots the workstation, it sends a message to obtain an IP address. Which Layer 2 and Layer 3 destination addresses will the message contain?
FF-FF-FF-FF-FF-FF and 255.255.255.255
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
Which FHRP implementation is a Cisco-proprietary protocol that supports IPv4 load sharing?
GLBP
Match the FHRP protocols to the appropriate description
GLBP -a Cisco proprietary FHRP that provides load sharing in addition to redundancy HSRP -a Cisco proprietary FHRP that provides redundancy through the use of an active device and standby device VRRP -an open standard FHRP that provides redundancy through the use of a virtual routers master and one or more backups
A network administrator is analyzing the features that are supported by different first-hop router redundancy protocols. Which statement describes a feature that is associated with HSRP?
HSRP uses active and standby routers
What is an advantage of configuring a Cisco router as a relay agent?
It can provide relay services for multiple UDP services
Which statement describes HSRP?
It is used within a group of routers for selecting an active device and a standby device to provide gateway services to a LAN
A network administrator configures a router to send RA messages with M flag as 0 and O flag as 1. Which statement describes the effect of this configuration when a PC tries to configure its IPv6 address?
It should use the information that is contained in the RA message and contact a DHCPv6 server for additional information
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
A company uses the method SLAAC to configure IPv6 addresses for the workstations of the employees. A network administrator configured the IPv6 address on the LAN interface of the router. The interface status is UP. However, the workstations on the LAN segment did not obtain the correct prefix and prefix length. What else should be configured on the router that is attached to the LAN segment for the workstations to obtain the information?
R1(config)# ipv6 unicast-routing
A client device on an Ethernet segment needs an IP address in order to communicate on the network. A DHCP server with IP address 192.168.1.1 has been configured and enabled on the network. How will a client device obtain a usable IP address for this network?
Send a DHCPDISCOVER message to physical address FF-FF-FF-FF-FF-FF
A small coffee shop is offering free Wi-Fi to customers. The network includes a wireless router and a DSL modem that is connected to the local phone company. What method is typically used to configure the connection to the phone company?
Set the WAN connection in the wireless router as a DHCP client
Match the DHCP message types to the order of the DHCPv4 process
Step 1 - DHCP DISCOVER Step 2 - DHCP OFFER Step 3 - DHCP REQUEST Step 4 - DHCP ACK
Match the step number to the sequence of stages that occur during the HSRP failover process. (Not all options are used.)
Step 4 -The new forwarding router assumes both the IP and MAC addresses of the virtual router Step 3 -The standby router assumes the role of the forwarding router Step 1 -The forwarding router fails Step 2 -The standby router stops seeing hello messages from the forwarding router
What is one indication that a Windows computer did not receive an IPv4 address from a DHCP server?
The computer receives an IP address that starts with 169.254
After a host has generated an IPv6 address by using the DHCPv6 or SLAAC process, how does the host verify that the address is unique and therefore usable?
The host sends an ICMPv6 neighbor solicitation message to the DHCP or SLAAC-learned address and if no neighbor advertisement is returned, the address is considered unique
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
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 router is configured for SLAAC operation
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 state is not maintained by the DHCPv6 server under stateless DHCPv6 operation
What is the reason that an ISP commonly assigns a DHCP address to a wireless router in a SOHO environment?
easy IP address management
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?
ip address dhcp
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 192.168.100.1 192.168.100.10 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
What information can be verified through the show ip dhcp binding command?
the IPv4 addresses that are assigned to hosts by the DHCP server
