Hi peoples,
There are a many mistakes here !
I have some corrections ;-)
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What determines how much data a sending station running TCP/IP can transmit before it must receive an acknowledgment?
segment size
transmission rate
bandwidth *
window size***************
sequence number
Explanation: CCNA 2 - Module 10.1.4
Window size determines the amount of data that can be transmitted at one time before the destination responds with an acknowledgment. After a host transmits the window-sized number of bytes, the host must receive an acknowledgment that the data has been received before it can send any more data. For example, if the window size is 1, each byte must be acknowledged before the next byte is sent
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Which of the following messages are sent from a DHCP server to a client during a successful configuration process? (Choose two.)
DHCPDISCOVER
DHCPOFFER *****************-------correct
DHCPREQUEST *
DHCPACK*******************
Explanation: CCNA 4 - Module 1.2.4 DHCP Operation
- When the server receives the broadcast, it determines whether it can service the request from its own database. If it cannot, the server may forward the request on to another DHCP server. If it can, the DHCP server offers the client IP configuration information in the form of a unicast DHCPOFFER. The DHCPOFFER is a proposed configuration that may include IP address, DNS server address, and lease time.
- The server that receives the DHCPREQUEST makes the configuration official by sending a unicast acknowledgment, the DHCPACK. It is possible, but highly unlikely, that the server will not send the DHCPACK. This may happen because the server may have leased that information to another client in the interim. Receipt of the DHCPACK message enables the client to begin using the assigned address immediately.
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Which statement is correct concerning routing and routed protocols?
A routed protocol allows the routers to communicate with other routers and maintain tables for a routing protocol. *-----Incorrect
A routing protocol allows routers to communicate with other routers and maintain tables for a routed protocol. ********************
Routers only need to use routing protocols to work properly.
There is no difference between routed and routing protocols.
Explanation:CCNA 1 - Module 10.1.1 / 10.2.1
-Routing is an OSI Layer 3 function. -1- Routing is a hierarchical organizational scheme that allows individual addresses to be grouped together. These individual addresses are treated as a single unit until the destination address is needed for final delivery of the data. -2- Routing finds the most efficient path from one device to another. The primary device that performs the routing process is the router.
The following are the two key functions of a router:
• Routers must maintain routing tables and make sure other routers know of changes in the network topology. They use routing protocols to communicate network information with other routers.
- A protocol is a set of rules that determines how computers communicate with each other across networks. Computers exchange data messages to communicate with each other. To accept and act on these messages, computers must have sets of rules that determine how a message is interpreted. Examples include messages used to establish a connection to a remote machine, e-mail messages, and files transferred over a network.
A protocol describes the following:
• The required format of a message
• The way that computers must exchange messages for specific activities
A routed protocol allows the router to forward data between nodes on different networks. -1- A routable protocol must provide the ability to assign a network number and a host number to each device. Some protocols, such as IPX, require only a network number. These protocols use the MAC address of the host for the host number. Other protocols, such as IP, require an address with a network portion and a host portion. These protocols also require a network mask to differentiate the two numbers. The network address is obtained by ANDing the address with the network mask.
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What is the purpose of the IOS enable secret command?
to set password protection on incoming Telnet sessions *--------------incorrect
to set password protection on the console terminal
to allow a user access to User mode
to allow a user to enter a password that will be encrypted *******************
Explanation: CCNA 2 - Module 3.1.3
he enable password and enable secret commands are used to restrict access to the privileged EXEC mode. The enable password is only used if the enable secret has not been set. The enable secret command should be used because the enable secret command is encrypted. The enable password command is not encrypted. The following commands are used to set the passwords:
Router(config)#enable password <password >
Router(config)#enable secret <password >
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Which address does a bridge use to build its bridging table?
destination IP address
destination MAC address *--------incorrect
source IP address
source MAC address **************
Explanation: CCNA 3 - Module 4.2.2
Bridges are Layer 2 devices that forward data frames based on the MAC address. Bridges read the SOURCE MAC address of the data packets to discover the devices that are on each segment. The MAC addresses are then used to build a bridging table. This allows bridges to block packets that do not need to be forwarded from the local segment
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Which component designates a device that is not compatible with ISDN and requires a terminal adapter?
NT1
NT2 *----------incorrect
TE1
TE2 ***********
Explanation: CCNA 4 - Module 4.1.5
The reference points that affect the customer side of the ISDN connection are as follows:
• R — References the connection between a non-ISDN compatible device Terminal Equipment type 2 (TE2) and a Terminal Adapter (TA), for example an RS-232 serial interface.
• S — References the points that connect into the customer switching device Network Termination type 2 (NT2) and enables calls between the various types of customer premises equipment.
• T — Electrically identical to the S interface, it references the outbound connection from the NT2 to the ISDN network or Network Termination type 1 (NT1).
• U — References the connection between the NT1 and the ISDN network owned by the telephone company.
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What is the term for the cabling that connects the customer premises equipment to the CO switch?
demarc
local loop *********************
final mile
DTE *-------incorrect
trunk line
Explanation: CCNA 4 - Module 2.1.1
The subscriber owns the CPE or leases the CPE from the service provider. A copper or fiber cable connects the CPE to the service provider’s nearest exchange or central office (CO). This cabling is often called the local loop, or "last-mile". A dialed call is connected locally to other local loops, or non-locally through a trunk to a primary center. It then goes to a sectional center and on to a regional or international carrier center as the call travels to its destination
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I hope that I will help other people who will try pass CCNA assesment ;-)
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