IPX SAP Filters : control access to IPX devices by controlling SAP, Cisco doesn’t forw SAP broad, save WAN link, Builds own SAP table, advt @ 60 sec. SAP svcs 4 Nw file server, 7 Print server, 24 Rem bridge server (router)

# config t, # access-list [number] [ permit / deny] 学生大 [svce type, 0 means all svcs],

# access-list 1010 deny 3d 7, # access-list 1001 permit -1, # int e0, (# ipx net 9e), If # ipx input-sap-filter 1001 (-1 all nets)

Input SAP filter : No. of svcs entered in to the SAP Table is reduced, contains only a subset of all svcs for propagation.

Output SAP filter : No. of svcs propagated from the table are reduced, only a portion of the table is propagated.

Placement : SAP filters must be placed close to the source to conserve critical bandwidth

MISC : Interface Status: Operational : serial1 is up, line protocol is up, Conn problem: serial1 is up, line protocol s down,

Int problem: Serial1 is down, Line protocol is down, Disabled : Serial1 is administratively down, line protocol is down

Conn Oriented- vir ckt, conn establmnt, term, sequenced, delivery ack, error recovery, sliding window flow control,

Conn Less- no VC, no sequence, no delivery guarantee, higher layer respon for error recovery, flow control, reliability.
Flow control: no data lost, simple hand shake, sliding window, ack with source,

AppleTalk config: # config t, # appletalk routing, # int e0, # appletalk cable-range 100-110, # appletalk zone bldgA

WAN Services : Switched/Delayed svcs:X.25, ISDN, Fr Relay, SDLC: P-P, P-multi P links, HDLC: Peer devices DDR.

POTS-most commonly used WAN service: DTE, DCE, demarc, CPE : Demarcation point: at which MOC cable ends (DP), CPE: Customer premise eqpt, Local loop: MOC cable path, CO (Central off): high speed trunk line area,

SDLC (Sync Data Link Control) : efficient, flexible & high speed, p to p & multi p links, un / bounded media, Half / Full Duplex, ckt & pkt switched nets, IBM uses in SNA (System Net Architecture) proto, Bit sync Data Link Layer proto, used in Cisco serial int to conn remote offices, supports two net node types:

Primary stns: control opn of other stns, poll secondaries, and setup/tear down/manage links.

Secondary stns : are controlled by primary stn, secondary can only send data to primary only after getting permission.

HDLC (High Level Data Link Control) : Bit oriented, link layer proto, specifies encapsulation for data on SDLC links.

(LAP & LAPB: are modified form of hdlc). R# sh int s0: shows hdlc config

Cisco HDLC: Cisco prop, doesn’t commte with other HDLC’s, default encapsulation in Cisco over sync serial links

Transfer Modes: used to define media access on WAN. HDLC supports following transfer modes

Normal Response Mode(NRM): Implemented in SDLC, Sec can’t commte with Prim unless Prim asks it to do so.

Asynch Response Mode (ARM): Allows Sec to commte with Prim w/o it’s permissioin.

Asynch Balanced Mode (ABM): Combined nodes (one acts as Prim / Sec) commtes each other w/o perm.

Link Access Procedure Balanced (LAPB): Integrated in to the X.25 proto stack, shares same frame format, frame types, and field functions as HDLC. Uses ABM xfer mode to est ckts with DTE / DCE.

Primaries- devices initiate commn, Secondaries-those responds to prim commn

Dial on Demand Routing (DDR): Allow WAN Link to be used intermitend for selected appl only. disable if, not in use.

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