Chapter 1 Flashcards
(37 cards)
What are the 6 common causes for LAN congestion
- Too many hosts in a collision or broadcast domains.
- Broadcast storms
- Too many multicast traffic
- Low bandwidth
- Adding hubs connectivity to the network.
- A bunch of ARP broadcasts.
What are the two advantages in using a routers in a network?
- Doesn’t forward broadcasts by default.
- Filters network based on Layer 3.
What are the advantages of using Layer 2 Switches?
- breaks up collision domains
- provides more bandwidth to users.
- switch frames between ports.
- low latency by using ASIC (Application-Specific Integrated Circuit)
- stores MAC addresses
- Layer 2 switches locate specific devices
What’s another name for NextGen Firewalls?
Cisco Firewall
What devices offer a full 7 Layer inspection?
NextGen Firewalls
NGFW offers the following 2 capabilities?
- Applications visibility and control (AVC)
- Intrusion Prevention System (IPS)
At a minimum, what does a NGFW must include?
- Be router and switch compatible.
- Add packet filtering w/ IPS and Malware inspection capabilities.
- Provide NAT
- Permit stateful inspection.
- Permit VPNs
- Provide URL and Application filtering.
- Third party integration
- Support for REST API
What are the benefits of having a network topology?
- Understanding where things belong.
- Brings order to complex models.
- Offer predictability.
What are the layers in a 3-tier hierarchical model?
- Core
- Distribution
- Access
The Core layer is responsible for what in a 3 Tier Hierarchical model
- transports large amounts of data.
- prime purpose is speed/reliability.
What is the responsibility of the Distribution Layer in a 3 Tier Hierarchical model?
- provide routing, filtering and WAN access.
- security and networking policies.
- NAT
- VLAN routing
What is the responsibility of the Access Layer in a 3 Tier hierarchical model?
- control users and workgroups access to network resources.
- create separate collision domains
- device connectivity
- QoS marking
What are characteristics of a collapsed Core/2 Tier Model?
- less expensive, benefits smaller companies.
- meant to maximize performance and availability while still allowing for scalability.
Describe Spine and Leaf Model.
- Leaf = Top of Rack (ToR) are attached to multiple servers in a single rack.
- Spine = are switches that connect all the leaves.
What are WANs needed for?
- Connection to Regional or Branch offices.
- Share data across large distances.
- Traveling workers.
What are the 3 major characteristics of WANs?
- Connect devices separated by a broad geographical area.
- Uses carriers and network providers
- Uses serial connections to provide access to bandwidth over larger geographical areas.
Define:
CPE
CSU/DSU
Local loop
CO
Toll networks
CPE - owned by subscribers
CSU/DSU - connect DTE to digital circuit
Local Loop - demarc to closest switching office or central office
Central Office - connect customer’s network to provider’s switching network
Toll Network - trunk line inside a WAN provider’s network.
What is the speed of a DS0?
64kbps
1 DS0 = 1 voice/data line
What is the speed of a T1?
1.544 Mbps (DS1)
24 DS0 bundle
What is the speed of a E1?
European equivalent of a T1
30 DS0
2.048 Mbps
What is the speed of a T3?
44.736 Mbos
28 DS1 bundle
What is the speed of a OC3?
155.52Mbps
3 DS3 (T3)
Fiber
What is the speed of a OC-12?
622.08 Mbps
4 OC-3
What is the speed of a OC-48?
2488.32 Mbps
4 OC-12
