PRACTICE Telecommunications and Network

• synchronous data link control
• allows secondary device to communicate with primary station in IBM architecture
• IBM proprietary protocol

• same function as SDLC – open protocol - addresses multipoint connections
• full-duplex connections - higher throughput

• PPP – replaced SLIP – offers more capabilities, both are encapsulation protocols used to carry
• data over serial lines

IPX – Inter network packet exchange – exists at the network level – Novell networks

PPTP – encapsulation and encryption , repackages frame and encrypts it - only works with IP


L2TP – just encapsulation - allows for tunneling over frame relay and ATM

Circuit-based proxy firewall – looks at header information of packet to make decision

Application based proxy firewall – look at information within the payload of the packet

Stateful firewall – firewall has table to track communication between devices and uses this to make decisions

• cables placed in plenum space – vents
• will not produce harmful chemicals in case of a fire.
• Nonplenum use polyvinyl jackets, plenum-rated use flouropolymers

ThinNet – thin coax – 185 meters, 10 mbps

– 0-1023

• Basic Rate Interface (BRI) ISDN service provides
• two bearer, or B channels, for data and one D, or control channel.
• Data is transferred over the B channels and the maitenance is on the D channel

PRI ISDN service provides 23 B channels and one D Channel

• Classless interdomain routing – CIDR
• IP addresses are running out –
• class A and Class B – too big – class C too small –
• CIDR allows to break up class B’s

• Trunk – used to connect switches for traffic of the same class
• - ex. Connection between two voice
• switches at a local phone company’s office … or connect lines or links of larger network

• SKA - The acess point (AP) will authenticate the wireless device with WEP key,
• the same key is used for encrypting data

- modems - devices can send data at will, sending a sequence of bits framed with start and stop bits and reassembled into data at the end

Synchronous communications - determine a synchronization scheme before data transmission

• Fiber Distributed Data Interface
• high-speed token-passing technology.
• Used in MAN technology, meaning it connects different networks.

• Address Resolution Protocol - Knows the IP address of a device and broadcasts message to find the matching MAC address.
• IP and mac info stored in ARP table

Internet Group Management Protocol - used to report multicast group memberships to routers.

standard that specifies security mechanisms for wireless networks - working group to deal with security flaws in WEP -

translation between WTLS and SSL. Wireless device will not use TCP/IP stack - point in time to translate WTLS to SSL

SONET -self-healing netowrk rings.

• Paying for guaranteed amount of frame relay bandwidth
• committed information rate

• Network address translation -
• uses NAT to translate intnernal address to public addresses

Circuit-level firewall - only look at the packet header infomration.

provides fixed bandwidth that can be allocated for specific applications

packets containing router information within their headers - can override routes within the router - should drop packets

• the beacom frame generates a failure domain, which is between the computer and the downstream neighbor,
• other computers on network will work around the failure.