CCNA Quiz Flashcards
(33 cards)
Your company wants to purshase some network hardware to which they can plug the 30 PCs in your department. Which type of network device is appropriate?
1 A router
2 A firewall
3 A switch
4 A Server
A switch
A switch is designed to connect many end hosts in the same LAN together.
You received a video file from a friends Phone using AirDrop. What was his phone functioning as in that transaction?
A A server
B A client
C A local area network (LAN)
What is your computer functioning as while you watch this video?
A A server
B An end host
C A client
A client
Your company wants to purchase some network hardware to connect its separate networks together. What kind of network device is appropriate?
A firewall
A host
A LAN
A router
A router
Your company wants to upgrade its old network firewall to one that provides more advanced functions. What kind of firewall should they purchase?
A host-based firewall
A next-level firewall
A next-generation firewall
A top-layer firewall
A next-generation firewall
A next-generation firewall (NGFW) is a part of the third generation of firewall technology, combining a traditional firewall with other network device filtering functions, such as an application firewall using in-line deep packet inspection (DPI), an intrusion prevention system (IPS). Other techniques might also be employed, such as TLS/SSL encrypted traffic inspection, website filtering, QoS/bandwidth management, antivirus inspection and third-party identity management integration (i.e. LDAP, RADIUS, Active Directory).
Note: A host-based firewall is a piece of software that runs on an end host, like Norton, AVG etc they are not Network firewall.
Ethernet
a system for connecting a number of computer systems to form a local area network, with protocols to control the passing of information and to avoid simultaneous transmission by two or more systems.
Why do we need network protocols/standards
Without network protocol there is no communication
It’s like one speaking Chinese and the othe one English
In 10Base-T
What represent the Base and T
Base= refers to baseband signaling T= twisted pair
What is the maximum length for:
Speed Name IEEE standard Informal name
10 Mbps Ethernet 802.3i 10Base-T
100 Mbps Fast Ethernet 802.3u 100 Base-T
1 Gbps Gigabit Ethernet 802.3ab 1000 Base-T
10 Gbps 10 Gig Ethernet 802.3an 10G Base-T
100m
What UTP cables stand for:
Unshielded Twisted Pair
Unshielded twisted pair (UTP) cables are widely used in the computer and telecommunications industry as Ethernet cables and telephone wires. In an UTP cable, conductors which form a single circuit are twisted around each other in order to cancel out electromagnetic interference (EMI) from external sources.
How many wires for:
10 Base-T and 100Base-T
2 pairs ( 4 wires)
How many wires for:
1000 Base-T and 10GBase-T
4 pairs (8 wires)
On UTP Cables 10Base-T and 100Base- T
How is the transmission made from Computer to Switch?
Computer transmit on wire 1 and 2
Switch receives on wire 1 and 2
Switch transmit on wire 3 and 6
Computer receives on 3 and 6
It’s Full-Duplex transmission, meaning
both devices receive and send at the same time
On UTP Cables 10Base-T and 100Base- T
How is the transmission made from Router to Switch?
Router transmit on wire 1 and 2
Switch receives on wire 1 and 2
Switch transmit on wire 3 and 6
Router receives on 3 and 6
It’s straight-through cable, because pin 1 connect to pin 1 and pin 2 to pin 2 etc
How to connect a Router to Router, a PC to a PC or a Switch to a Switch?
Crossover Cable
Pin 1 and 2 on left connect to 3 and 6 on the right
Pin 1 and 2 on the right connect to 3 and 6 on the left
On UTP Cables 10Base-T and 100Base- T
How is the transmission made from Router to PC?
Crossover cable
Pin 1 and 2 on left connect to 3 and 6 on the right
Pin 1 and 2 on the right connect to 3 and 6 on the left
Among all hardwares below, which one don’t transfert: Tx pins 1, 2 and Rx pins 3,6
Router
Firewall
PC
Switch
Switch
Only switch transmits 3,6 and receives 1,2 (it’s the opposite of the router, firewall and pc)
That’s why switch connect to router, firewall and pc with straight-through cable
But to connect router, firewall and pc together we need crossover cable
Nowadays, do we really need crossover cable?
Not really, most devices have Auto MDI-X, it automatically detects the sending pins from
The connected device and adjust.
On UTP Cables 1000Base-T and 10 GBase-T
How is the transmission made from Router to Switch?
Router transmit on wire 1, 2 and 7,8
Switch receives on wire 1, 2 and 7,8
Switch transmit on wire 3,6 and 4,6
Router receives on 3,6 and 4,6
Each pair is bidirectional
What is SFP Transceiver?
(Small Form-Factor Pluggable)
How Fiber Optic cable send data?
Rather than sending electric signal over copper wiring, this cables send light over glass fiber.
There are two connectors one to send data the other one to receive data.
Transfer on the right means receive on the left
Receive on the left means transfer on the right
How many layers has Fiber Optic cable?
Four layers
- The fiberglass core itself
- Cladding that reflects light
- A protective buffer
- The outer jacket of the cable
What are the particularities of the Multimode Fiber?
- Core diameter is wider than sigle mode fiber.
- Allows multiple angles (modes) of light waves to enter the fiberglass core
- Allows longer cables than UTP, but shorter cables than single-mode fiber
- Cheaper than single-mode fiber (due to cheaper LED-based SFP transmitters).
What are the particularities of the Single-mode Fiber?
- Core diameter is narrower than multimode fiber
- Light enters at a single angle(mode) from a laser based transmitter
- Allows longer cables than both UTP and Multimode fiber
- More expensive than Multimode fiber ( due to more expensive laser-based SFP transmitters)
