Layer Two Topics for (100-105) CCENT CCNA

Started by deanwebb, April 28, 2017, 02:24:11 PM

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deanwebb

April 28, 2017, 02:24:11 PM
Layer Two Topics for (100-105) CCENT CCNA

A sends a packet to B. The packet passes from A to switch1, to switch2, and then to B. Does the source IP address change? Does the source MAC address change? If either changes, describe the changes.

A switch keeps track of the physical addresses of attached devices. What is that database called? What commands can be used to see the information in that database?

PC A sends a frame to a switch. The switch has ports G0/0 through G0/48. The PC is on interface G0/1. What will the switch do with the frame if it has no entries in its MAC table?

When making a decision to forward a frame, what does a switch use to make that decision? What does a router use to make that decision?

A device on switchport G1/1 sends a packet to a device on switchport G1/2 of the same switch. The device on port G1/2 sends a reply to G1/1. Which port or ports will the switch flood the reply packet on?

Why would a hub not need to keep track of MAC addresses of connected devices?

A device is preparing a frame to send to another IP address, but it does not have the MAC address for its destination. What will this device do to discover the MAC address for its destination?

Under what conditions will a device send an ARP request?
Under what conditions will a device respond to an ARP request?
In an ARP request, what is the destination IP address and destination MAC address?
What is the RARP protocol and what does it do?

In CSMA/CD, what do stations do before transmitting data?
In CSMA/CD, what do stations do if they accidentally transmit at the same time? What is the algorithm used to manage that situation called?

What are the differences between full-duplex and half-duplex Ethernet connections?
Which one has collisions?
Which one is most efficient?
What happens by default if a device that supports only half-duplex is connected to a Cisco switchport?
Can hubs support full-duplex?

What problems could result from configuring a switch port to use a specific speed and not allowing it to auto-negotiate?

What are the differences between buffering, windowing, and load balancing?

In networking, what is flow control and what is it used for?

Why do switches increase the number of collision domains, even if the number of broadcast domains remains constant?

In network A, eight devices connect to a hub.
In network B, eight devices connect to a switch.
How many collision domains exist in network A?
How many collision domains exist in network B?

What Cisco IOS commands can provide security for the access layer?
What command would specify that only a device with the MAC address of FAD5FADE would be able to connect to a given switchport?

What Cisco IOS commands provide connectivity on the access layer? (HINT: don't forget something obvious, like turning something on...)

What does it mean if an interface is up, but line protocol is down?
Take a baseball bat and trash all the routers, shout out "IT'S A NETWORK PROBLEM NOW, SUCKERS!" and then peel out of the parking lot in your Ferrari.
"The world could perish if people only worked on things that were easy to handle." -- Vladimir Savchenko
Вопросы есть? Вопросов нет! | BCEB: Belkin Certified Expert Baffler | "Plan B is Plan A with an element of panic." -- John Clarke
Accounting is architecture, remember that!
Air gaps are high-latency Internet connections.

deanwebb

#1
January 11, 2020, 01:35:58 PM
Take a baseball bat and trash all the routers, shout out "IT'S A NETWORK PROBLEM NOW, SUCKERS!" and then peel out of the parking lot in your Ferrari.
"The world could perish if people only worked on things that were easy to handle." -- Vladimir Savchenko
Вопросы есть? Вопросов нет! | BCEB: Belkin Certified Expert Baffler | "Plan B is Plan A with an element of panic." -- John Clarke
Accounting is architecture, remember that!
Air gaps are high-latency Internet connections.
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