4618219
Description
Flashcards by Scott Coleman, updated more than 1 year ago
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Created by Scott Coleman
about 8 years ago
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| Question | Answer |
| Midterm study | . |
| What Are characteristics of the core layer? | High-speed packet forwarding Avoids CPU-intensive packet manipulation |
| What Are characteristics of the Distribution layer? | Routing Policy-based connectivity QOS helps Isolate problems between Core and Access Layers |
| What Are characteristics of the Access layer? | Layer 2 switching Port security Spanning tree |
| Circuit vs. Packet Switched Networks | Circuit must be created before any data exchanged – “Connection Oriented” Circuit exists even when no data being exchanged Packet switched Data (Packet) can be sent with no prior knowledge of path it will take – “Connectionless” All users share Bandwidth |
| What is SONET/SDH | SONET is Synchronous Optical Networking from America SDH is Synchronous Digital Hierarchy from Europe essentially they are the same |
| what is WDM/DWDM | Wavelength Division Multiplexing 8 channels Dense WDM over 80 channels enables full-duplex over one strand of fiber. |
| What is important about Cisco HDLC | Cisco uses a non-standard version Cisco HDLC is not compatible with non-Cisco equipment Must use a different encapsulation such as PPP Only works on synchronous links it is default on cisco equipment |
| characteristics of PPP encapsulation | Framing similar to HDLC Works on synchronous and asynchronous Link Control Protocol Network Control Protocols |
| What is LCP | Allows negotiation and monitoring of advanced features |
| what is NCP | Allows PPP to support different network-layer protocols IPv4, IPv6, AppleTalk, Novell IPX, etc. |
| what is frame relay held together by? | Permanent Virtual Circuits that use DLCI's (Data Link Connection Identifiers ) to uniquely identify and route traffic |
| what is Link Management Interface | LMI is the Protocol running between the router and the local Frame Relay (FR) switch exchanging control and management information |
| What Frame relay congestion protocols exsist? and what do they do? | FECN Notifies devices in the direction the frame is going BECN Notifies devices in the direction of the source (upstream) that there is congestion on the network |
| What are the positives and negatives of NAT? (at least 3) | Good Conserves private addresses Increases flexibility Simpler internal network addressing schemes Provides simple network security Bad Performance is degraded End-to-end IP traceability is lost Many protocols do not work with NAT IPsec is incompatible with NAT |
| IPSEC vs. GRE | IPsec Provides security Only handles IP unicast traffic GRE Generic Route Encapsulation Provides no security Handles (virtually) all traffic |
| logging sevritys 0-7? | Emergency Alert Critical Error Warning notification informational debugging |
| command to send console debugging to vty? | logging monitor |
| What is NTP? what port? what time format? | Network Time Protocol UDP port 123 Coordinated Universal Time (UTC) |
| What is SNMP? which version is secure? | Simple Network Management Protocol Only v3 is secure |
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