Chapter 3 - Fundamentals of WANs Flashcards
What is a CPE?
Customer premises equipment
What is a CSU/DSU?
Channel service unit/data service unit. This can be either integrated into the serial interface of the router or sit outside the router as an external device.
What are the 2 most popular data link layer protocols?
High-Level Data Link Control (HDLC)
Point-to-Point Protocol (PPP)
What are 3 examples of Internet Access Links?
1) Leased Line
2) DSL
3) Cable
In a DSL connection, what is the DSLAM?
Stands for DSL Access Multiplexer which is a device that resides at the telco. It splits out the data and push that towards the Internet router and sends voice traffic to the voice switch.
DSL and cable support asymmetric speeds. What does that mean?
The transmission speed from the ISP toward the home (downstream) is much faster than the transmissions towards the ISP (upstream).
What is the Ethernet Equivalent of the FCS field in the HDLC Trailer field?
The FCS field.
What is the Ethernet Equivalent of the Control field in the HDLC Header field?
The type field.
What is the Ethernet Equivalent of the Address field in the HDLC Header field?
The destination address field.
What is the Ethernet Equivalent of the Flag field in the HDLC Header field?
The preamble field.
Which Ethernet header field lists a recognizable bit pattern so that the receiving nodes realize that a new frame is arriving?
Preamble
Which Ethernet header field identifies the destination device?
Destination Address
Which Ethernet header field identifies the type of Layer 3 packet encapsulated inside the frame?
Type
Which Ethernet trailer field is used by the error detection process?
FCS (frame check sequence)
