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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. What is the maximum cabling distance for 10GBASE-CX4?
15 metres
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
Switch#show interfaces {interface}
Switch(config-if)#shutdown

2. What are the letters used with 10GBASE-X two-letter suffixes to specify the transceiver wavelengths?
In parallel revealing the best (longest) match in a single table lookup
Switch#show ip cef {interface} [detail]
S = Short; L = Long; E = Extra-long
Switch(config)#errdisable detect cause dhcp-rate-limit

3. What is 10BASE-T?
Encapsulation failure; Unresolved address; Unsupported protocol; No valid route; No valid adjacency; Checksum error
Static access or trunk
Cabling specification for 10 Mbps Ethernet over Unshielded Twisted Pair (UTP) cabling
Switch(config-if)#speed {10 | 100 | 1000 | auto}

4. What is the TCAM Value and Mask for an extended IP access list using TCP/UDP?
Full duplex only
Switch(config)#no ip cef
Source IP (/32) - Destination IP (/32) - Protocol (/16) - IP ToS (/8) - Source port (/16) - Source operator (/4) - Destination port (/16) - Destination operator (/4)
Switch#show interfaces {interface}

5. What connectors can be used with GBIC modules?
Switch(config)#errdisable detect cause arp-inspection
Switch(config-if)#shutdown
1000BASE-CX - 1000BASE-T - 1000-BASE-SX - 1000-BASE-LX/LH and 1000-BASE-ZX
SC fibre optic or RJ-45 UTP

6. How is link speed determined on Fast Ethernet links configured to autonegotiate?
Manually by administratively disabling and re-enabling the port
On
By electrical signalling so that either end of a link can determine what speed the other end is trying to use
15 metres

7. What is 10GBASE-CX4?
Switch(config)#interface range {type}{module}/{number} [- {number}] [ - {type}{module}/{number} ...]
Route caching and topology based
10 Gigabit Ethernet over copper CX4 with Infiniband connectors
Manually by administratively disabling and re-enabling the port

8. What are the supported duplex mode settings for Gigabit Ethernet on Cisco switches?
Full duplex only
Switch(config)#errdisable detect cause dtp-flap
Switch(config)#errdisable detect cause udld
Gigabit Ethernet over 1 pair Shielded Twisted Pair (STP) cabling

9. What is the maximum cabling distance for 1000BASE-LX/LH?
Accelerated CEF (aCEF) and Distributed CEF (dCEF)
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
Switch(config)#interface range macro {name}
400 metres half duplex and 2000 metres full duplex

10. What is the default duplex mode of a Gigabit Ethernet interface?
Switch(config-if)#switchport mode access
LAN PHY and WAN PHY
Full duplex
The Layer 3 forwarding engine

11. Displays entries in the Forwarding Information Base (FIB) for a specific subnet
Full duplex if only one of the two stacking connectors is used; Half duplex over a shared bus if if both connectors are used
Switch(config)#errdisable recovery cause {all | {cause-name}}
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]
Interconnecting switches in a campus network

12. What is the original standard for Ethernet (10 Mbps)?
LAN PHY and WAN PHY
IEEE 802.3
Switched virtual interface (SVI)
Fast Ethernet over 2 pairs EIA/TIA Category 5 UTP

13. What is CAM?
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF (850 nm laser)
Content-Addressable Memory
400 metres half duplex and 2000 metres full duplex
Static access or dynamic

14. What function is performed by the Switching Database Manager (SDM)?
Partition and tune the TCAM on some Catalyst switches into areas for different functions
Switch(config)#default interface {interface}
Tunnel
The switch port falls back to default setting of half duplex

15. What is 1000BASE-CX?
R = LAN PHY; W = WAN PHY
Gigabit Ethernet over 1 pair Shielded Twisted Pair (STP) cabling
The CEF entry version number
Manually by administratively disabling and re-enabling the port

16. What is 1000BASE-LX/LH?
300 seconds
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF or 9 micron SMF (1300 nm laser)
Value - Mask - and Result (VMR)
Switch(config)#errdisable detect cause bpduguard

17. What is a GigaStack GBIC?
Accelerated CEF (aCEF)
Switch(config)#mac address-table aging-time {seconds}
A proprietary connector with a high-data-rate copper cable with enhanced signal integrity and EMI performance
Switch(config)#interface range {type}{module}/{number} [- {number}] [ - {type}{module}/{number} ...]

18. What are the basic operations that a frame undergoes as it passes through a multilayer switch?
Adjacent MAC address (6 octets); Layer 3 engine MAC address (6 octets); EtherType (2 octets)
Ingress queueing; Destination MAC lookup (CAM); Destination IP lookup (FIB); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Layer 3 packet rewrite; Egress queueing
Switch(config-if)#speed {10 | 100 | 1000 | auto}
The Drop adjacency

19. What is the administrative mode of a switch port that uses DTP to negotiate its operational mode?
Dynamic
Trunk
CEF punt
Source MAC (/48); Destination MAC (/48); Ethertype (/16)

20. Disables a switch port
Switch(config)#default interface {interface}
Switch(config-if)#shutdown
Carrier Sense Multiple Access Collision Detection
300 seconds

21. What is error-disable state?
Switch#show interfaces status err-disabled
Store-and-forward
From 30 seconds to 86 -400 seconds (24 hours)
A switch port that has been shut down automatically due to a serious error condition

22. What technology was merged into the IEEE 802.3 Ethernet standard to create Gigabit Ethernet?
ANSI X3T11 FibreChannel
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP
Trunk or dynamic
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF (850 nm laser)

23. What RJ-45 pins have been swapped in a Category 5 UTP crossover cable for Fast Ethernet?
Source IP (/32); Destination IP (/32); Protocol (/16); ICMP code (/8); ICMP type (/4); IP type of service (ToS) (/8)
1 -2 on one end with 3 -6 on the other end
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8)

24. What connectors can be used with SFP modules?
Cisco Express 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)
LC - MT-RJ or RJ-45
Process the first packet in a traffic flow to determine the destination

25. What information is stored in TCAM?
Switch(config)#errdisable detect cause loopback
CEF punt
Static access or dynamic
Security and QoS ACLs

26. Enables error-disable detection
Multilayer Switching
Store-and-forward
Switch(config)#errdisable detect cause {all | {cause-name}}
Switch(config)#errdisable detect cause psecure-violation

27. How are ports that are in error-disable state re-enabled by default?
ANSI X3T11 FibreChannel
Static access or trunk
Switch(config)#errdisable detect cause loopback
Manually by administratively disabling and re-enabling the port

28. Sets the speed of a Fast Ethernet or Gigabit Ethernet interface
Cisco Express Forwarding
Switch(config-if)#speed {10 | 100 | 1000 | auto}
Collision domain
Down - static access - trunk or tunnel

29. What is 1000BASE-ZX?
LC - MT-RJ or RJ-45
Value - Mask - and Result (VMR)
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)
On

30. Enables error-disable for when the port link state is flapping between the up and down states
Enable error-disable for all possible causes
A proprietary connector with a high-data-rate copper cable with enhanced signal integrity and EMI performance
Switch(config)#errdisable detect cause link-flap
Collision domain

31. Resets the configuration of a switch port to its default values
Switch(config)#errdisable detect cause storm-control
Switch(config)#default interface {interface}
Switch(config-if)#duplex {auto | full | half}
When there are more access list entries and Layer 4 operations than available Mask/Value and LOU entries

32. What is 10GBASE-LR/LW?
The switch port falls back to default setting of half duplex
The table of learned MAC addresses - ports - and VLAN information
10 Gigabit Ethernet over 9 micron SMF (1310 nm serial laser)
The Punt adjacency

33. How are the TCAM Mask/Value pairs evaluated?
Switch(config-if)#speed {10 | 100 | 1000 | auto}
In parallel revealing the best (longest) match in a single table lookup
Partition and tune the TCAM on some Catalyst switches into areas for different functions
Off

34. How do Layer 2 switches provide isolation between hosts?
IEEE 802.3
Adjacent MAC address (6 octets); Layer 3 engine MAC address (6 octets); EtherType (2 octets)
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8)

35. What tables are maintained by the CEF Layer 3 engine?
Switch#show interfaces {interface}
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8); IGMP message type (/8)
Routing table and ARP table
10 Gigabit Ethernet over 9 micron SMF (1310 nm serial laser)

36. Displays a list of all interfaces in an error-disabled state
Switch#show interfaces status err-disabled
Accelerated CEF (aCEF)
Cisco Express Forwarding
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

37. What is the default timer for automatic re-enabling of error-disabled ports?
Switch(config)#no ip cef
300 seconds
The CEF epoch number
Switch#show cef not-cef-switched

38. What is WWDM?
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP
Switch(config-if)#switchport access vlan {vlan}
Source IP (/32); Destination IP (/32); Protocol (/16); ICMP code (/8); ICMP type (/4); IP type of service (ToS) (/8)
Wide-Wavelength Division Multiplexing

39. What CEF optimisation replicates the entire FIB table among switch line cards?
300 seconds
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)
Distributed CEF (dCEF)
CEF glean

40. What type of packets can not be forwarded by CEF but are instead sent to the switch CPU for process switching in software?
Switch(config-if)#shutdown
ARP requests and replies; IP packets requiring an ICMP response; IP broadcasts to be relayed; Routing protocol updates; CDP packets; Packets needing encryption; Packets triggering NAT; Other non-IP packets
R = LAN PHY; W = WAN PHY
1 -2 on one end with 3 -6 on the other end

41. Displays the CAM table size with number of MAC addresses
Switch#show mac address-table count [address {mac-address}] [interface {interface}] [vlan {vlan}]
Forwarding Information Base
A three-fold combination of 0 - 1 and X (don't care)
Switch(config-if)#switchport access vlan {vlan}

42. Creates an interface-range macro
SC fibre optic or RJ-45 UTP
Wide-Wavelength Division Multiplexing
1000BASE-CX - 1000BASE-T - 1000-BASE-SX - 1000-BASE-LX/LH and 1000-BASE-ZX
Switch(config)#define interface-range {macro-name} {type} {module}/{number} [- {number}] [ - {type} {module}/{number} ...]

43. Creates a switched virtual interface (SVI) and enters interface configuration mode
300 seconds
Partition and tune the TCAM on some Catalyst switches into areas for different functions
Switch(config)#interface vlan {vlan-id}
Incomplete adjacency; Incomplete ARP resolution; Unsupported packet features; ICMP redirect; Packets destined to the router itself; IP options present; Access list evaluation failure; Fragmentation failure

44. What is the operational mode of a switch port that carries traffic for multiple VLANs?
Switch(config)#errdisable detect cause channel-misconfig
A station must wait its turn to transmit; it can't transmit and receive at the same time
Trunk
American National Standards Institute

45. What is the operational mode of a switch port that carries transparent Layer 2 VPNs?
The Layer 3 forwarding engine
10GbE operates only at full duplex
Tunnel
10GBASE-SR/SW - 10GBASE-LR/LW - 10GBASE-ER/EW - 10GBASE-LX4/LW4 - 10GBASE-CX4

46. What is the maximum cabling distance for 10GBASE-LX4/LW4?
Feature Manager (FM) and Switching Database Manager (SDM)
Cabling specifications for Gigabit Ethernet
A proprietary connector with a high-data-rate copper cable with enhanced signal integrity and EMI performance
300 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF

47. What is CEF?
Feature Manager (FM) and Switching Database Manager (SDM)
Cisco Express Forwarding
Layer 2 source and destination MAC addresses; Layer 3 Time-To-Live (TTL) value and header checksum
The Null adjacency

48. What is IEEE?
Institute of Electrical and Electronics Engineers
Interconnecting switches in a campus network
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
Multilayer Switching

49. What is the TCAM Value and Mask for an IP access list?
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8)
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]
10 km
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

50. Where is source and destination addresses and other relevant protocol information for access lists stored in the TCAM table?
In TCAM Value entries
Configure the appropriate values manually on both ends of the link
The CEF epoch number
A name assigned to a ranges of interfaces