Chapter 17 - Operating Cisco Routers Flashcards
Which of the following installation steps are more likely required on a Cisco router, but not typically required on a Cisco switch? (Choose two answers.)
a. Connect Ethernet cables
b. Connect serial cables
c. Connect to the console port
d. Connect the power cable
e. Turn the on/off switch to “on”
B and E. Cisco routers have an on/off switch, but Cisco switches generally do not.
Which of the following commands might you see associated with the router CLI, but not with the switch CLI?
a. The clock rate command
b. The ip address address mask command
c. The ip address dhcp command
d. The interface vlan 1 command
A. Both switches and routers configure IP addresses, so the ip address address mask and ip address dhcp commands could be used on both routers and switches. The interface vlan 1 command applies only to switches.
You just bought two Cisco routers for use in a lab, connecting each router to a different LAN switch with their Fa0/0 interfaces. You also connected the two routers’ serial interfaces using a back-to-back cable. Which of the following steps are not required to be able to forward IPv4 packets on both routers’ interfaces? (Choose two answers.)
a. Configuring an IP address on each router’s Fast Ethernet and serial interfaces
b. Configuring the bandwidth command on one router’s serial interface
c. Configuring the clock rate command on one router’s serial interface
d. Setting the interface description on both the Fast Ethernet and serial interface of each router
B and D. To route packets, a router interface must have an IP address assigned and be in an “up and up” interface state. For a serial link created in a lab, without using CSU/DSUs, one router must be configured with a clock rate command to the speed of the link. The bandwidth and description commands are not required to make a link operational.
The output of the show ip interface brief command on R1 lists interface status codes of “down” and “down” for interface Serial 0/0. Which of the following could be true?
a. The shutdown command is currently configured for that interface.
b. R1’s serial interface has been configured to use Frame Relay, but the router on the other end of the serial link has been configured to use PPP.
c. R1’s serial interface does not have a serial cable installed.
d. Both routers have been cabled to a working serial link (CSU/DSUs included), but only one router has been configured with an IP address.
C. If the first of the two status codes is “down,” it typically means that a Layer 1 problem exists (for example, the physical cable is not connected to the interface).
Which of the following commands do not list the IP address and mask of at least one interface? (Choose two answers.)
a. show running-config
b. show protocols type number
c. show ip interface brief
d. show interfaces
e. show version
C and E. The show ip interface brief command lists all the interface IPv4 addresses but none of the masks. The show version command lists none of the IP addresses and none of the masks. The other three commands list both the address and mask.
Which of the following is different on the Cisco switch CLI for a Layer 2 switch as compared with the Cisco router CLI?
a. The commands used to configure simple password checking for the console
b. The number of IP addresses configured
c. The configuration of the device’s hostname
d. The configuration of an interface description
B. A router has one IPv4 address for each interface in use, whereas a LAN switch has a single IPv4 address that is just used for accessing the switch. The rest of the answers list configuration settings that use the same conventions on both routers and switches.
