Computer Networking

255.0.0.0

255.0.0.0
The default subnet mask of a class A network is 255.0.0.0

If the propagation delay is very long, as in the case of a space probe on or near Mars or Venus, forward error correction is indicated. It is also appropriate, in a military situation in which the receiver does not want to disclose his location by transmitting. If the error rate is low enough that an errorcorrecting code is good enough, it may also be simpler. Finally, real-time systems cannot tolerate waiting for retransmissions.

they are a pieces of metal covered in plastic coating (for insulation) that deliver electricity to an electrical object e.g. TV act as a connection to the earth system of the appliance/house. They are also cables which are armoured for TV aerials etc

Peers

Remote Supervisor Adapter

PCI adapter which simplifies remote system management by providing around-the-clock remote access to the server. The RSA monitors the server and sends out alerts to designated recipients via LAN, pager, email or SNMP if a failure is detected.

10 minutes

48 bits expressed as a hexdecimal number.

Answered by TC44, South Africa.

802.3 is the IEEE standard for Ethernet devices and data managment

Of the network you are connected to? Type "//dns $server" in the mIRC.

ISDN BRI is a Basic Rate Interface for ISDN networks (Intergrated Services Device Network). It consists of 2 Channels: B+D. B channel is used for data and voice and consists of two 64Kbps channels=128Kbps. D channel is used for the signal and control of the interface and is 16Kbps. Together the B+D chanels are refered to as 2B+D. The maximum data rate on a BRI is therefore 128Kbps.

NOTE:PRI is Primary rate Interface which uses 23x64Kbps B channel and 1x64Kbps D channel (T-1)

/**

* Return the byte of DHCP option data.

*

* @param client DHCP client.

* @param ptr pointer obtained by dhcp_get_option_ptr().

*

* @return byte value at the given address.

*/

static u8_t dhcp_get_option_byte(u8_t *ptr)

{

LWIP_DEBUGF(DHCP_DEBUG, ("option byte value=%"U16_F"\n", (u16_t)(*ptr)));

return *ptr;

}

#if 0

/**

* Return the 16-bit value of DHCP option data.

*

* @param client DHCP client.

* @param ptr pointer obtained by dhcp_get_option_ptr().

*

* @return byte value at the given address.

*/

static u16_t dhcp_get_option_short(u8_t *ptr)

{

u16_t value;

value = *ptr++ << 8;

value |= *ptr;

LWIP_DEBUGF(DHCP_DEBUG, ("option short value=%"U16_F"\n", value));

return value;

}

#endif

/**

* Return the 32-bit value of DHCP option data.

*

* @param client DHCP client.

* @param ptr pointer obtained by dhcp_get_option_ptr().

*

* @return byte value at the given address.

*/

static u32_t dhcp_get_option_long(u8_t *ptr)

{

u32_t value;

value = (u32_t)(*ptr++) << 24;

value |= (u32_t)(*ptr++) << 16;

value |= (u32_t)(*ptr++) << 8;

value |= (u32_t)(*ptr++);

LWIP_DEBUGF(DHCP_DEBUG, ("option long value=%"U32_F"\n", value));

return value;

}

#endif

Peers are those people, who have not yet finished downloading and are downloading and uploading at the same time. If you have got choice, it's almost always better to pick a torrent with the most seeders.

an end device

What are two functions of the data link layer? (Choose two.)

It segments and reorders the data.

It exchanges data between programs that are running on the source and destination hosts.

***It controls how data is placed onto the media.

It generates signals to represent the bits in each frame.

***It encapsulates each packet with a header and a trailer to transfer it across the local media.

============================

1. Data Link layer do not reorder data - this is the job of Transport Layer

2. Programs are at Aplication Layer

4. Physical Layer generate signals

A modem is a low cost solution to connect a computer to the internet. They are cheap to buy and use existing phone infrastructure to form a network. They can also be more useful than a standard network connection because they can be moved around much easier, without needing to rewire or reconfigure network settings.

Sounds like someone changed your language from English to something else on your computer. Go to Start>Control Panel>you should see and Icon for Time/Date. Check that window and see if you are still in English.

WINs[ windows internet naming service] tracks the relationships between host names and IP address, DNS [Nomain name service] is more popular because it works on all platforms.

* Initiator sends connection request (w. id) * Responder sends accept or reject (w. id) * Responder assumes connection exists when it sends the ack * Initiator assumes connection exists when it receives the ack * OK if network service reliable and CO * If not? (consider lost, old conn reqs/ack)

Peer IP address

Encryption and Algorithms

Pre-Shared Key

mode(agressive/main)

DH-Group

local ip address (other site of VPN)

that is the conbfiguartion details needed..

One major block of addresses reserved for special purposes is the IPv4 experimental address range 240.0.0.0 to 255.255.255.254.

Currently, they cannot be used in IPv4 networks. However, these addresses could be used for research or experimentation.

point to point and multipoint

IP trunking VoIP on a larger scale such as a business. The business all use the same data connection which is split between all devices.

Cross-Over sanctions are federal orders in which the national government pulls or threatens to pull funding from one state-relate expense because of an unrelated offense. Think of pulling funding from state road budgets because of high alcohol-related accidents.

in tcp header (32 bits) we have a field that is called options and padding that has variable in length and the header length shows the actual header size

i.e size of 20 octets+size of options and padding field

and in UDP we dont have any field like that and its header is fixed of 8 OCTETS (32 bits header size)

refrence: WIRELESS COMMUNICATIONS AND NETWORKS by William Stallings

Second Edition pg 91(see fig)