2 Core 1: Networking Free Online FlashCards

What does a WAN connect?

A WAN connects distant networks; the internet is the largest example.

Which OSI layer handles IP addressing and routing?

IP addressing and routing are Layer 3 functions in the OSI model.

What does a default gateway do?

A default gateway, usually a router, forwards traffic destined for another subnet.

What does DNS do?

DNS translates host names, such as example.com, into IP addresses.

What does a 169.254.x.x IPv4 address commonly indicate?

A 169.254.x.x address commonly means the device could not contact DHCP and self-assigned an APIPA address.

Which three IPv4 ranges are reserved for private networks?

The private IPv4 ranges are 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16.

What is an important security limitation of NAT?

NAT translates private internal addresses for internet access, but NAT alone is not a complete security control.

Which protocol provides encrypted remote command-line access?

SSH provides encrypted remote command-line access and commonly uses TCP port 22.

What delivery characteristics does TCP provide?

TCP establishes a connection and provides ordered, reliable delivery.

How do common uses of single-mode and multimode fiber differ?

Single-mode fiber is suited to longer distances; multimode fiber is commonly used over shorter links.

How are the ends of a straight-through cable terminated?

A straight-through cable uses the same wiring standard at both ends: T568A at both ends or T568B at both ends.

How do 2.4 GHz Wi-Fi bands generally compare with higher-frequency bands?

The 2.4 GHz band often reaches farther but can be more congested; higher-frequency bands can offer more capacity but may have less range through obstacles.