Cisco switch CLI as compared with the Cisco router
What are the steps in
physically installing a router?
·
Step 1. Connect any
LAN cables to the LAN ports.
Step 2. If using an external CSU/DSU, connect the router's serial interface to
the CSU/DSU and the CSU/DSU to the line from the telco.
Step 3. If using an internal CSU/DSU, connect the router's serial interface to
the line from the telco.
Step 4. Connect the router's console port to a PC (using a rollover cable), as
needed, to configure the router. Step 5. Connect a power cable from a power
outlet to the power port on the router.
Step 6. Power on the router.
What are the two most
common commands on routers to display interfaces and their statuses?
·
Show ip interface
brief: Displays a list with one line per interface, wit some basic information,
inclidng the interface IP address and interface status.
2) Show ip interfaces: lists interfaces, but with a large amount of information
per interface.
On a Cisco router's
interfaces what is the first and second codes referring to?
·
First status refers to
the Line status or Layer 1 status - for example, ins the cable installed, its
it the right/wrong cable, is the device on the other end powered on?
Second status refers to the protocol status or Layer 2 status -. It is always
down if the line status is down. If the line status is up, a protocol status of
down is usually caused by a mismatched data link layer configuration.
On a cisco router what
does the following combination of interface status codes mean?
Line Status Protocol Status
1) Administratively down Down
2) Down Down
3) Up Down
4) Up Up
·
The interface has a
shutdown command configured on it.
2) The interface is not shutdown, but the physical layer has a problem. For
example, no cable has been attached to the interface, or with Ethernet, the
switch interface on the other end of the cable is shut down or the switch is
powered off.
3) Almost always refers to data link layer problems, most often configuration
problems. For example, serial links have this combination when one routers was
configure to use PPP and the other default to use HDLC.
4) Layer 1 and Layer 2 of this interface are functioning.
What commands are used
on Cisco routers to configure an interface's IP?
·
Use the interface sub
command ip address (provide address and mask)
Show protocols command
on Cisco routers
·
Displays the state of
each interface as well as the IP address and mask configured on those
interfaces.
Which of the following
installation steps are typically 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
·
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 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 host name
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.
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