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CCIE R&S - WAN
CCIE R&S - Written - WAN
| Question | Answer |
|---|---|
| Which frame relay DLCIs are reserved? | 0-15 and 1008-1023 |
| How does the router know what LMI type to use? | auto-sense by trying each one |
| What three LMI options are there? | Cisco, ANSI, Q.933 - Annex A |
| What does the LMI status ACTIVE mean? | Healthy on each end and data can be transferred |
| What does the LMI status INACTIVE mean? | local connection is healthy, but the remote side is not |
| What does the LMI status DELETED mean? | No LMI, or the DLCI was deleted from the SP Frame-Relay switch |
| What is the full mesh formula? | [n(n-1)]/2 |
| Why was Phase II of DMVPN created? | to permit the dynamic creation of spoke-to-spoke tunnels |
| What 3 technologies is used by DMVPN? | IPSec, Multipoint GRE (mGRE), and Next Hop Resolution Protocol (NHRP) |
| This DMVPN technology is used to dynamically register addresses from the spokes | Next Hop Resolution Protocol (NHRP) |
| This DMVPN technology is used to transport data and routing information from the hub to multiple (potential) spokes | mGRE |
| Command to create DMVPN mGRE tunnel? | tunnel mode gre multipoint |
| Commands to configure the two phases of IPSec | crypto isakmp policy and crypto ipsec transform |
| Command to create an IPSec profile to | crypto ipsec profile |
| What is the typical size of a Frame Relay DLCI header? | 10 bits |
| When a FR switch notices congestion, what first action will it take? | Set FECN bit for router receiving the data. |
| What devices can set the FECN bit? | Frame Relay switches only |
| How does the Frame Relay switch notify the sending router that it needs to lower it's shaping rate? | Setting the BECN bit |
| What devices can set the BECN bit? | |
| When a FR switch notices congestion, what action can it take immediately aside from setting the FECN or BECN bit on DTE forwarded traffic? | Generate a Q.922 test frame with the BECN set |
| What LMI message can DTE send to the FR switch? | LMI Status Enquiry |
| What type of message does the FR Switch reply with when it receives an LMI message from the DTE? | LMI Status |
| How often are LMI keepalive messages sent? | Every 10 seconds |
| When not inquired, when are full status LMI messages sent? | Every 6th LMI message |
| What DLCI does Cisco LMI use for operation? Assignable DLCI range? | 1023, 16-1007 |
| What DLCI does Anis LMI use for operation? Assignable DLCI range? | 0, 16-991 |
| What DLCI does Q.933 Annex A LMI use for operation? Assignable DLCI range? | 0, 16-991 |
| The FR LAPF contains a header and a trailer. What is the FR LAPF header used for? What information does the header contain? | Used by FR Switches in FR cloud; DLCI, FECN BECN, DE |
| What does the FR encapsulation header contain? What is it used for? | Contains a protocol type field. It is used for DTE to DTE multiple Layer3 support |
| What two FR encapsulation options are there? | Cisco, IETF |
| What three options are the for FR Payload compression? | Packet-by-packet, data stream, and FRF.9 |
| What algorithm is used by the FR payload compression options? | LZS |
| What two methods are there for FRF.12 fragmentation implementation? | Legacy (uses map-class), Interface |
| What 3 options are there for FR fragmentation? | FRF.12, FRF.11-c, Frame-Relay LFI with MLP |
| What is FRF.11-c used for? | VoFR |
| In FRF.11-c, voice frames are always ___________, but never __________. | interleaved, fragmented |
| Which Frame Relay fragmentation method uses PPP, Multilink, and a virtual template? | Frame-Relay LFI with MLP |
| What does Cisco's version of HDLC add to the standard? What does this addition contain? | 2 byte Type field, Protocol field and padding field |
| What two categories make up the PPP standards? | Layer 3 unrelated features (LCP), Layer 3 specific features (NCP) |
| Link Quality Monitoring (LQM), Looped link detection, Layer 2 load balancing, and Authentication are an example of what PPP category? | LCP |
| IPCP and CCP are examples of what PPP category? | NCP |
| How does Link Quality Monitoring work in PPP? | Routers exchange stats about error-free frame percentage, link dropped if level falls below configured value |
| How does Looped link detection work in PPP? | "Routers generate and send random ""Magic Number,"" if it receives its own, brings link down" |
| How are frames sent over PPP Multilink interfaces? | Frames fragmented into one fragment per link or based on fragmentation delay |
| What does MLP add to each fragment for reassembly? | Headers (2 or 4 bytes), contains sequence number field and flab bits designated beginning and end |
| What two interface types can PPP multilink use? | Multilink, Virtual-Templates |
| How is the ppp multilink fragment-delay measured? | milliseconds |
| What determines which fragmented packet to send with ppp multilink? | Queuing scheduler on multilink |
| What compression types can PPP negotiate? | Layer 2 payload, IP/TCP header, IP/UDP/RTP header |
| What three options are there for PPP Layer 2 payload compression? | Lempel-Ziv Stacker (LZS), Microsoft Point-to-Point Compression (MPCC), Predictor |
| What Layer interface must be used for Layer 2 payload compression with ATM-to-Frame Relay Service? | MLP |
| What PPP Layer 2 payload option is supported on both Frame-Relay and HDLC links? | Lempel-Ziv Stacker (LZS) |
| What is the normal efficiency of PPP IP/TCP header compression? | 40 bytes to 3 or 5 bytes |
| What is the normal efficiency of PPP IP/UDP/TCP header compression? | 40 bytes to 2 or 4 bytes |
| What two configuration options are there for PPP header compression? | Legacy (configured on ppp serial link or multilink), MQC |
Created by:
ajballer15
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