12733436
Description
Flashcards by Luis Domínguez, updated more than 1 year ago
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Created by Luis Domínguez
about 6 years ago
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| Question | Answer |
| BW requirements are determined by | 1- types of applications 2- traffic flows 3- size of the user community |
| 100BASE-TX 100BASE-T2 100BASE-T4 100BASE-FX | EIA/TIA Category 5 UTP 2 100m EIA/TIA Category 3, 4, 5 UTP 2 100m EIA/TIA Category 3, 4, 5 UTP 4 100m (MMF) 1 400 m half duplex or 2000 m full duplex (SMF) 1 10 km |
| 1000BASE-CX 1000BASE-T | STP 1 25 m UTP Cat5 4 100 m |
| 1000BASE-SX *S | MMF 1 275m SMF 1 550m *850 nm |
| 1000BASE-LX/LH *L | MMF 1 550m SMF 1 10km *1300 |
| 1000BASE-ZX *Z | MMF 1 70km SMF 1 100km *1550 |
| Standard and difference in 10 GB Ethernet | - IEEE 802.3ae - Difference of the predecessors only in the PHY (operate only in Full-Duplex) |
| PMD | - Physical Media Dependent |
| Physical Media Dependent | - Various types of transceivers for 10 GBE |
| LAN PHY | - Interconnects switches in a campus network, predominant in the core layer |
| WAN PHY | - Interfaces with SONET or SDH networks founded in WANs |
| Physical Media Dependent | -Physical Layer specifications Interfaces defined in 10 GBE - LAN PHY -WAN PHY |
| 10GBASE-SR/SW | MMF: 66m MMF: 300m MMF: 33m |
| 10GBASE-LR/LW *L | SMF 10km *1310 |
| 10GBASE-ER/EW *E | SMF 40km *1550 |
| 10GBASE-LX4/LW4 (1310 nm WWDM) | MMF 300m SMF 10km |
| 10GBASE-CX4 | Copper: CX4 with Infiniband connectors 15m |
| PHY type R Phy type L | LAN PHY WAN PHY |
| LX4/LW4 | L: 1310 X: coding used 4: numbers of wavelength transmitted |
| Explains Ethernet autonegotiation | The link speed is determined by electrical signaling. If both end are configured with autonegotiation, they will use highest speed in the link |
| Interface range MACRO | switch (config)#define interface-range PORTCHANNEL fa0/1 , fa0/2 - 5 , fa0/10 switch(config)#interface range PORTCHANNEL |
| Explains how to configure the port speed | Use the speed command to set a speed of 10, 100, 1000, or Autonegotiate (the default). |
| Explains how to configure the port duplex mode | A port can operate in half-duplex, full-duplex, or autonegotiated mode. Autonegotiation is allowed only on UTP 10/100 and 10/100/1000 ports Switch(config-if)# duplex { auto | full | half} |
| Explains how to configure port error detection | By default, a Catalyst switch detects an error condition. Err-disable state if detect an error cause: Switch(config)# [ no ] errdisable detect cause [ all | cause-name ] |
| Automatically Recover from Error Conditions | 1.- shutdown no shutdown - Before re-enable the interface we must detect the issue. Switch(config)# errdisable recovery cause [ all | cause-name ] [port down for 300 seg (default)] Switch(config)# errdisable recovery interval seconds (change timer) |
| Explains how to verify the port state | #show interfaces Ge 0/0 #show interfaces status #show interfaces status err-disable |
| Explains how to verify port speed and duplex mode | #show interfaces G0/0 Always make sure both ends of a connection are set to the same speed and duplex mode |
| Covers CDP neighbor discovery | - Advertisements are sent at regulars intervals, nothing is expected in return - Layer 2 - Only connected neighbors - Enable by default - 60 seconds interval |
| Switch1#show cdp neighbors Switch1# show cdp neighbors gig1/0/22 detail | The software release, the neighbor’s DUPLEX MODE, and POWER REQUIREMENTS that have been negotiated |
| Enable/Disable CDP | (config)#[no] cdp run Switch(config)# interface f0/0 Switch(config-if)# [ no ] cdp enable |
| LLDP | - IEEE 802.3ab - Information advertised by grouping attributes into TLV. example: advertise its system name in one TLV, your mngmt add in other TLV an so on. - Advertisements then become in one chain of TLV |
| LLDP-MED TLV | - Audio-visual devices (VoIP) - Link Layer Discovery Protocol - Media Endpoint Device Type Length Value - Carry useful information link VLAN, QoS NUMBER, POWER MANAGEMENT, etc. - Supported by LLDP by default, but can't send basic and MED TLV simultaneously on a switchport. If a switch receives LLDP-MED TLVs, it will begin sending LLDP-MED TLVs. |
| LLDP default settings and verifying and show commands | - Disabled by default #show lldp #[no]lldp run #show lldp neighbors #show lldp neighbors f0/0 detail (config-if)#int f0/0 (config-if)#[no] lldp [receive|transmit] |
| Describes Power over Ethernet for Cisco IP phones | Provide 48v DC to a device over the UTP that is used for connectivity. The DC power is supplied by the switch itself. |
| Lists IEEE 802.3af PoE device classes (predetermined voltages) | Power Class Maximum Power Offered 0 (default) 15.4W 1 4.0W 2 7.0W 3 15.4W 4 (802.3at) Up to 30W |
| Métodos PoE | Cisco Inline Power ILP 7W IEEE 802.3af PoE 15.4W IEEE 802.3at PoE+ 25.5W Cisco Universal PoE UPoE 60W |
| PoE | - Power disabled when port down - Continually try to detect a powered device - Begin supply small power. It then can measure the resistance across the pairs. If a 25K ohm is detected a power device is present. |
| PoE Power Classes | Normally a switch will offer a maximum of 15.4W per port. With this V the device can power up a portion of its circuit. If additional power is needed, the device can inform by CDP or LLDP advertisements to request up to 30W allowed for class 4. |
| UPoE | - Cisco Universal PoE (60W) - A device can request more than 30W of power. The device can use special TLVs with CDP or LLDP to request UPoE up to max of 60W. (Only 4500 offer UPoE) |
| Configuring PoE | By default port can automatically detect the presence of PoE capable device before applying power. Switch(config-if)# power inline { auto | static } [ max milliwatts ] Switch(config-if)# power inline never |
| AUTO keyword (config poe) | Connected device can request power through CDP or LLDP and the switch will attempt to deliver it, up to 30W. |
| STATIC keyword (config poe) | Preallocate a fixed amount of power to a device |
| MAX keyword (config poe) | Maximum amount of power to offer on the interface. from 4000 to 30000 mw (4 to 30 W) |
| Verifying PoE | Switch# show power inline First few lines display info about the current power budget. The switch has 710.0W available for PoE; 110.4W are used, leaving 599.6W for additional PoE use. |
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