QUESTION 1
What is the first 24 bits in a MAC address called?
A. NIC
B. BIA
C. OUI
D. VAI
Correct Answer: C
Explanation
Organizational Unique Identifier (OUI) is the first 24 bits of a MAC address for a network device, which indicates
the specific vendor for that device as assigned by the Institute of Electrical and Electronics Engineers,
Incorporated (IEEE). This identifier uniquely identifies a vendor, manufacturer, or an organization.
QUESTION 2
System flash director
File Length Name/status
1 3802992 c827v-y6-mz.121-1.XB
[3803056 bytes used,4585552 available, 8388608 total]
8192K bytes of processor board System flash(Read/Write)
The technician wants to upload a new IOS in the router while keeping the existing IOS. What is the maximum
size of an IOS file that could be loaded if the original IOS is also kept in flash?
A. 3MB
B. 5MB
C. 7MB
D. 4MB
Correct Answer: D
Explanation
From the exhibit we learn there are 4585552 bytes (over 4MB) available so it is only enough space for an IOS
file of 4MB. If bigger file is copied then the existing IOS file will be erased (overwritten).
QUESTION 3
What is the meaning of the output MTU 1500 bytes?
A. The maximum number of bytes that can traverse this interface per second is 1500.
B. The minimum segment size that can traverse this interface is 1500 bytes.
C. The minimum segment size that can traverse this interface is 1500 bytes.
D. The minimum packet size that can traverse this interface is 1500 bytes.
E. The maximum packet size that can traverse this interface is 1500 bytes.
F. The maximum frame size that can traverse this interface is 1500 bytes.
Correct Answer: E
Explanation
The Maximum Transmission Unit (MTU) defines the maximum Layer 3 packet (in bytes) that the layer can pass
onwards.
QUESTION 4
A network interface port has collision detection and carrier sensing enabled on a shared twisted pair network.
From this statement, what is known about the network interface port?
A. This is a 10 Mb/s switch port
B. This is a 100 Mb/s switch port.
C. This is an Ethernet port operating at half duplex.
D. This is an Ethernet port operating at full duplex.
E. This is a port on a network interface card in a PC.
Correct Answer: C
Explanation
Modern Ethernet networks built with switches and full-duplex connections no longer utilize CSMA/CD. CSMA/
CD is only used in obsolete shared media Ethernet (which uses repeater or hub).
QUESTION 5
In an Ethernet network, under what two scenarios can devices transmit? (Choose two)
A. when they receive a special token
B. when there is a carrier
C. when they detect no other devices are sending
D. when the medium is idle
E. when the server grants access
Correct Answer: CD
Explanation
Ethernet network is a shared environment so all devices have the right to access to the medium. If more than
one device transmits simultaneously, the signals collide and can not reach the destination.
If a device detects another device is sending, it will wait for a specified amount of time before attempting to
transmit.
When there is no traffic detected, a device will transmit its message. While this transmission is occurring, the
device continues to listen for traffic or collisions on the LAN. After the message is sent, the device returns to its
default listening mode.
So we can see C and D are the correct answers. But in fact “answer C – when they detect no other devices are
sending” and “when the medium is idle” are nearly the same.
QUESTION 6
Which two locations can be configured as a source for the IOS image in the boot system command? (Choose
two)
A. RAM
B. NVRAM
C. flash memory
D. HTTP server
E. TFTP serve
F. Telnet server
Correct Answer: CE
Explanation
The following locations can be configured as a source for the IOS image:
+ Flash (the default location)
+ TFTP server
+ ROM (used if no other source is found)
QUESTION 7
What is the difference between a CSU/DSU and a modem?
A. A CSU/DSU converts analog signals from a router to a leased line; a modem converts analog signals from
a router to a leased line.
B. A CSU/DSU converts analog signals from a router to a phone line; a modem converts digital signals from a
router to a leased line.
C. A CSU/DSU converts digital signals from a router to a phone line; a modem converts analog signals from a
router to a phone line.
D. A CSU/DSU converts digital signals from a router to a leased line; a modem converts digital signals from a
router to a phone line.
Correct Answer: D
QUESTION 8
A Cisco router is booting and has just completed the POST process. It is now ready to find and load an IOS
image. What function does the router perform next?
A. It checks the configuration register
B. It attempts to boot from a TFTP server
C. It loads the first image file in flash memory
D. It inspects the configuration file in NVRAM for boot instructions
Correct Answer: A
Explanation
When you turn the router on, it runs through the following boot process.
The Power-On Self Test (POST) checks the router’s hardware. When the POST completes successfully, the
System OK LED indicator comes on.
The router checks the configuration register to identify where to load the IOS image from. A setting of 0×2102
means that the router will use information in the startup-config file to locate the IOS image. If the startup-config
file is missing or does not specify a location, it will check the following locations for the IOS image:
1. Flash (the default location)
2. TFTP server
3. ROM (used if no other source is found)
The router loads the configuration file into RAM (which configures the router). The router can load a
configuration file from:
QUESTION 9
Router#show running-config
Building configuration:
Current configuration : 659 bytes
!
version 12.4
no service timestamps log datetime msec
no service timestamps debug datetime msec
service password-encryption
!
hostname Router
!
enable secret 5 $1$mERr$hx5rVt7rPNoS4wqbXKX7m0
!
interface FastEthernet0/0
ip address 192.168.1.1 255.255.255.0
ip access-group 101 in
duplex auto
speed auto
!
access-1ist 101 deny tcp any any eq 22
access-1ist 101 permit ip any any
!
line con 0
password 7 0822455D0A16
login
line vty 0 4
login
line vty 5 14
login
!
end
A network administrator cannot establish a Telnet session with the indicated router. What is the cause of this
failure?
A. A Level 5 password is not set.
B. An ACL is blocking Telnet access.
C. The vty password is missing.
D. The console password is missing.
Correct Answer: C