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Ethernet Technologies

Subject : it-skills

Instructions:

Answer 50 questions in 15 minutes.
If you are not ready to take this test, you can study here.
Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.

1. Changes an interface to a layer 3 interface and erases all layer 2 interface configurations
Forwarding Information Base
Switch(config)#errdisable detect cause ilpower
Switch(config-if)#no switchport
Stations can transmit and receive at the same time because switched Ethernet removes the possibility of collisions

2. What are the supported duplex mode settings for Gigabit Ethernet on Cisco switches?
Full duplex only
Switch(config)#errdisable detect cause loopback
10GBASE-SR/SW - 10GBASE-LR/LW - 10GBASE-ER/EW - 10GBASE-LX4/LW4 - 10GBASE-CX4
Switch#show ip cef {interface} [detail]

3. What RJ-45 pins must be swapped in a Category 5 UTP crossover cable for Gigabit Ethernet?
Native routed interface
Trunk or dynamic
1 -2 on one end with 3 -6 on the other end - and 4 -5 on one end with 7 -8 on the other end
Trunk

4. What is the standard for Fast Ethernet (100 Mbps)?
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP
Cabling specifications for Gigabit Ethernet
IEEE 802.3u
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding

5. What is the administrative mode of a switch port that carries traffic for multiple VLANs?
70 km for 9 micron SMF; 100 km for 8 micron SMF
Multilayer Switching
Logical Operation Unit
Trunk or dynamic

6. What fields are rewritten in hardware before a Layer 3 packet is switched to the to egress queue of a multilayer switch?
Switch#show interfaces status err-disabled
Switch(config)#errdisable detect cause dtp-flap
In TCAM Value entries
Layer 2 source and destination MAC addresses; Layer 3 Time-To-Live (TTL) value and header checksum

7. What is the administrative mode of a switch port that is a member of one VLAN?
Static access or dynamic
Static access
Adjacent MAC address (6 octets); Layer 3 engine MAC address (6 octets); EtherType (2 octets)
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF

8. What is the maximum cabling distance for 1000BASE-LX/LH?
Adjacent MAC address (6 octets); Layer 3 engine MAC address (6 octets); EtherType (2 octets)
Switch(config)#errdisable detect cause dhcp-rate-limit
Switch(config)#interface range {type}{module}/{number} [- {number}] [ - {type}{module}/{number} ...]
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF

9. What is the administrative mode of a switch port that carries transparent Layer 2 VPNs?
Tunnel
Process the first packet in a traffic flow to determine the destination
Only temporarily for debugging purposes
7 100BASE-T2 full duplex; 6 100BASE-TX full duplex; 5 100BASE-T2 half duplex; 4 100BASE-T4; 3 100BASE-TX; 2 10BASE-T full duplex; 1 10BASE-T

10. What is 10GBASE-X?
They are dropped (ARP throttling)
Switch(config)#interface range {type}{module}/{number} [- {number}] [ - {type}{module}/{number} ...]
Cabling specifications for 10 Gigabit Ethernet
When the Spanning Tree Protocol (STP) has put the switch port in learning or forwarding state

11. What is CSMA/CD?
Carrier Sense Multiple Access Collision Detection
Switch#show running-config interface {interface}
Trunk or dynamic
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX

12. What is the maximum cabling distance for 1000BASE-CX?
Switch(config)#interface range {type}{module}/{number} [- {number}] [ - {type}{module}/{number} ...]
25 metres
Switch(config)#errdisable recovery cause {all | {cause-name}}
Switch#show interfaces {interface}

13. Sets the speed of a Fast Ethernet or Gigabit Ethernet interface
400 metres half duplex and 2000 metres full duplex
Cabling specification for 10 Mbps Ethernet over Unshielded Twisted Pair (UTP) cabling
Bundling together two to eight full duplex Fast Ethernet links to act as a single physical link
Switch(config-if)#speed {10 | 100 | 1000 | auto}

14. What are the Fast Ethernet autonegotiation selection priorities?
Switched virtual interface (SVI)
Switch(config-if)#description {string}
7 100BASE-T2 full duplex; 6 100BASE-TX full duplex; 5 100BASE-T2 half duplex; 4 100BASE-T4; 3 100BASE-TX; 2 10BASE-T full duplex; 1 10BASE-T
Switch(config)#errdisable detect cause security-violation

15. What are the common PMD types for 10 Gigabit Ethernet?
In parallel revealing the best (longest) match in a single table lookup
Source MAC address; Port of arrival; VLAN; Time stamp
10GBASE-SR/SW - 10GBASE-LR/LW - 10GBASE-ER/EW - 10GBASE-LX4/LW4 - 10GBASE-CX4
They are dropped (ARP throttling)

16. What is the DTP negotiation mode of a switch port configured as trunk?
On
Switch#show mac address-table count [address {mac-address}] [interface {interface}] [vlan {vlan}]
The switch port falls back to default setting of half duplex
Switch#show interfaces status

17. Disables a switch port
Switch#show cef drop
300 seconds
Switch(config)#errdisable detect cause vmps
Switch(config-if)#shutdown

18. When are mode-conditioning patch leads required with 1000BASE-LX/LH transceivers?
Slow response times - low throughput - runts and other input errors on the switch ports
Layer 3 routing information builds and pre-populates a single database of the entire network topology; All table lookups are performed in hardware with the longest matching destination used in forwarding
With MMF cables shorter than 100 metres (to prevent over-driving the far-end receiver) and with MMF cables longer than 300 metres (to lessen the effect of differential mode delay)
Source IP (/32); Destination IP (/32); Protocol (/16); ICMP code (/8); ICMP type (/4); IP type of service (ToS) (/8)

19. How does the IEEE 802.3ae standard differ from its predecessors at the physical layer?
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
10GbE operates only at full duplex
Store-and-forward

20. What is the default duplex mode of a Gigabit Ethernet interface?
Full duplex
10 km
Switch(config)#errdisable detect cause gbic-invalid
10 Gigabit Ethernet over 9 micron SMF (1310 nm serial laser)

21. Displays CEF Punt statistics with number of packets and reason for each line card
Half duplex
Switch#show cef not-cef-switched
Routing table and ARP table
IEEE 802.3u

22. What is the administrative mode of a switch port that uses DTP to negotiate its operational mode?
Switch#show ip cef {interface} [detail]
IEEE 802.3ab
Switch#show interfaces {interface} switchport
Dynamic

23. What is the content of TCAM Result entries?
Switch(config)#errdisable detect cause storm-control
CEF punt
Partition and tune the TCAM on some Catalyst switches into areas for different functions
Numeric values that represent what action to take after the TCAM lookup occurs

24. What are the administrative modes of Layer 2 switched interfaces?
Creating the VLAN
Static access - trunk - tunnel or dynamic
1000BASE-CX - 1000BASE-T - 1000-BASE-SX - 1000-BASE-LX/LH and 1000-BASE-ZX
Wide-Wavelength Division Multiplexing

25. What are the 10GBASE-X PMD transceiver form factors used in Cisco Catalyst switches?
Switch(config)#errdisable recovery interval {seconds}
Flooding a frame with unknown destination MAC address out all ports assigned to the source port VLAN except the source port itself
XENPAK - X2 - or SFP+
Source IP (/32) - Destination IP (/32) - Protocol (/16) - IP ToS (/8) - Source port (/16) - Source operator (/4) - Destination port (/16) - Destination operator (/4)

26. When do collisions occur?
The table of learned MAC addresses - ports - and VLAN information
ANSI X3T11 FibreChannel
Cabling specifications for Gigabit Ethernet
When one station transmits at the same time as another on a shared medium

27. What is the standard for 1000BASE-T?
IEEE 802.3ab
Switch#show ip cef
Switched virtual interface (SVI)
400 metres half duplex and 2000 metres full duplex

28. What is the TCAM Value and Mask for an extended IP access list using TCP/UDP?
Source IP (/32) - Destination IP (/32) - Protocol (/16) - IP ToS (/8) - Source port (/16) - Source operator (/4) - Destination port (/16) - Destination operator (/4)
1 -2 on one end with 3 -6 on the other end - and 4 -5 on one end with 7 -8 on the other end
Switch(config)#errdisable detect cause dhcp-rate-limit
Cabling specifications for Gigabit Ethernet

29. Disables CEF operation on an interface
400 metres half duplex and 2000 metres full duplex
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)
Switch(config-if)#no ip route-cache cef
Switch(config)#errdisable recovery cause {all | {cause-name}}

30. What is the content of TCAM Mask entries?

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31. Displays error-disabled recovery timer information
Switch#show errdisable recovery
Switch(config)#errdisable detect cause gbic-invalid
Switch#show interfaces {interface} switchport
Cisco Express Forwarding

32. What is 10BASE-T?
Switched virtual interface (SVI)
IEEE 802.3
Entry not in FIB; FIB table full; IP TTL expired; MTU exceeded; ICMP redirect; Unsupported encapsulation; Tunnelled packets requiring compression or encryption; Access list with 'log' option; NAT must be performed
Cabling specification for 10 Mbps Ethernet over Unshielded Twisted Pair (UTP) cabling

33. How is the TCAM organised?
1 -2 on one end with 3 -6 on the other end
By Mask/Value - where each unique mask has eight value patterns associated with it
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF
Switch#show running-config interface {interface}

34. How does topology based switching work?
40 km
Layer 3 routing information builds and pre-populates a single database of the entire network topology; All table lookups are performed in hardware with the longest matching destination used in forwarding
In TCAM Value entries
Compiling Access Control Entries (ACE) into the TCAM table

35. What technology was merged into the IEEE 802.3 Ethernet standard to create Gigabit Ethernet?
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance
Layer 2 destination address changed to next-hop MAC address; Layer 2 source address changed to outbound interface MAC address; Layer 3 TTL decremented by 1; Layer 3 IP checksum recalculated; Layer 2 frame checksum recalculated
IEEE 802.3
ANSI X3T11 FibreChannel

36. What is the default duplex mode of a Fast Ethernet interface?
Collision domain
The CEF entry version number
On
Half duplex

37. How are ternary combinations implemented?
10 Gigabit Ethernet over 9 micron SMF (1310 nm serial laser)
Switch#show interfaces status
With a mask value in addition to binary values to decide which keys in a table are relevant
Distributed CEF (dCEF)

38. What happens to subsequent packets destined for FIB entries in CEF glean state?
Switch(config)#errdisable detect cause bpduguard
Creating the VLAN
A station must wait its turn to transmit; it can't transmit and receive at the same time
They are dropped (ARP throttling)

39. What is 10GBASE-CX4?
1 -2 on one end with 3 -6 on the other end
10 Gigabit Ethernet over copper CX4 with Infiniband connectors
SC or MT-RJ
Compiling Access Control Entries (ACE) into the TCAM table

40. What is Cisco's old recommendation regarding switch port speed and duplex mode?
Packets that have been truncated before they were fully received
SC fibre optic or RJ-45 UTP
Cisco Express Forwarding
Configure the appropriate values manually on both ends of the link

41. Enables error-disable detection
Collision domain
SVI or native routed interface
Switch(config)#errdisable detect cause {all | {cause-name}}
Switch(config)#errdisable detect cause vmps

42. What are the letters used with 10GBASE-X two-letter suffixes to specify the PHY type?
On
Listen to the first packet and put its resulting destination in the MLS cache; Route subsequent packets in the same flow based on the MLS cache
They are dropped (ARP throttling)
R = LAN PHY; W = WAN PHY

43. What is 100BASE-TX?
Static access - trunk - tunnel or dynamic
Fast Ethernet over 2 pairs EIA/TIA Category 5 UTP
Route caching and topology based
SVI or native routed interface

44. What is TCAM?
LAN PHY and WAN PHY
Ternary Content-Addressable Memory
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP
When the Spanning Tree Protocol (STP) has put the switch port in learning or forwarding state

45. What changes are made to packets by the CEF packet rewrite engine just before forwarding?
Switch(config)#errdisable detect cause unicast-flood
Layer 2 destination address changed to next-hop MAC address; Layer 2 source address changed to outbound interface MAC address; Layer 3 TTL decremented by 1; Layer 3 IP checksum recalculated; Layer 2 frame checksum recalculated
Switch(config)#errdisable detect cause bpduguard
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)

46. When should CEF be disabled?
Only temporarily for debugging purposes
Fast Ethernet over 4 pairs EIA/TIA Category 3 - 4 - 5 UTP
Switch#show mac address-table static [address {mac-address}] [interface {interface}] [vlan {vlan}]
Enable error-disable for all possible causes

47. What is the standard for 10 Gigabit Ethernet (10GbE)?
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF
IEEE 802.3ae
Switch#show cef not-cef-switched
Switch(config)#define interface-range {macro-name} {type} {module}/{number} [- {number}] [ - {type} {module}/{number} ...]

48. What are the common cabling specifications for Gigabit Ethernet?
Switch#show interfaces status err-disabled
1000BASE-CX - 1000BASE-T - 1000-BASE-SX - 1000-BASE-LX/LH and 1000-BASE-ZX
Source IP (/32) - Destination IP (/32) - Protocol (/16) - IP ToS (/8) - Source port (/16) - Source operator (/4) - Destination port (/16) - Destination operator (/4)
On

49. What is half duplex operation?

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50. What are the common cabling specifications for Fast Ethernet?
Entry not in FIB; FIB table full; IP TTL expired; MTU exceeded; ICMP redirect; Unsupported encapsulation; Tunnelled packets requiring compression or encryption; Access list with 'log' option; NAT must be performed
Accelerated CEF (aCEF) and Distributed CEF (dCEF)
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX
When the Spanning Tree Protocol (STP) has put the switch port in learning or forwarding state