Deck 15: Core Network

Question 1

Which of the following terms does not belong to the core network?

A) Backbone network connecting cities, regions or countries.
B) Primarily fiber optic infrastructure.
C) Multiple protocols deployed.
D) Primary transmission medium used fiber optic cable, microwave and coaxial cable.
E) All of the above

Answer 1

Primary transmission medium used fiber optic cable, microwave and coaxial cable.

Question 2

The two primary network topologies deployed in the core are ________ and ________.

Answer 2

mesh ring

Question 3

ESMF is a type of fiber deployed in the core network.

Answer 3

False

Question 4

The regional communications interconnection point between metro and core networks and between core network and core network is referred to as the ________.

A) ISO
B) POP
C) Communications Hub
D)Central Office
E) Both b and c
F) None of the above

Question 5

The ITU has defined four core segments. They are referred to as ________, ________, ________, ________.

Question 6

Fiber optic cable laid across the ocean floor is referred to as submarine cable.

Question 7

The NDZSF stands for:

A) Nyquist Dispersion Zero Shifted Fiber
B) Number Zero Dispersion Shifted Fiber
C) NonDispersion Zero Shifted
D) None of the above

Question 8

The core network is configured with a ________ path to ensure traffic continues to flow even when the ________ path goes down.

Question 9

The primary advantage a mesh network has over a ring configured network is the low switch over times from working to protection path.

Question 10

It is not necessary to run dispersion tests and characterize fiber used in core networks.

Question 11

Core networks are sized according to:

A) Traffic patterns
B) Route paths
C) Expected CPU usage
D) All of the above
E) None of the above

Question 12

Typically a core router is equipped with a fiber optic interface.

Question 13

Optical interfaces deployed in core routers include:

A) DS3
B) FastE
C) GigE
D) SONET OC-3
E) SONET OC-12
F) a and b
G) b, c, d, e
H)All of the above

Question 14

Core networking equipment is typically placed in a Carrier Hotel located within a centralized area within a region.

Question 15

A Carrier Hotel has all of the following attributes.

A) Power back-up - 100% uptime provided.
B) Diverse network paths into the building.
C) Secure site.
D) Interconnection to other carrier's networks.
E) All of the above

Question 16

Multiplexers are used in the core network to aggregate DS0's onto the core network.

Question 17

A SONET mux is defined by its line speed. The most common line speeds deployed in the core network are:

A) OC-3, OC-12, OC-48, OC-192
B) OC-1, OC-12
C) OC-3, OC-12, OC-48
D) STS-1, OC-48, OC-192
E) All of the above

Question 18

A cross connect matrix within a SONET mux ________ channels together onto one circuit.

Question 19

A SONET mux is segmented into two primary areas. One is the ________ side, the second is the ________ side.

Question 20

One of the main reasons network engineers are able to cost justify DWDM in the core network is:

A) The amount of traffic traveling between point A and point B.
B) Network monitoring capability.
C) Distance between point A and point B.
D) Cost to build fiber plant.
E) Low cost of DWDM equipment.
F) a, b, c, d
G) a, c, d
H)All of the above

Question 21

The term Op Amp refers to an optical amplifier used to repeat or regenerate the signal.

Question 22

A DWDM network is designed with optical amplifiers placed strategically between point A and point B. The number and placement of the Op Amp is determined by:

A) Signal Loss
B) Type of fiber
C) Distance
D) Manufacturer specs
E) No. of wavelengths deployed
F) All of the above

Question 23

The ITU has designed specific frequencies for optical DWDM systems. The windows defined by the ITU are ________, ________, ________ and ________.

Question 24

One fiber optic strand is capable of carrying billions of bits every second allowing for multiple wavelengths each carrying OC-192 speeds on one strand of fiber.