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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 an interface-range macro?
Switch(config)#errdisable detect cause vmps
A name assigned to a ranges of interfaces
10 Gigabit Ethernet over 50 or 62.5 micron MMF or 9 micron SMF (1300 nm WWDM laser)
A three-fold combination of 0 - 1 and X (don't care)

2. What information is stored in CAM?
Switch(config)#errdisable detect cause bpduguard
In TCAM Value entries
300 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
The table of learned MAC addresses - ports - and VLAN information

3. What is the TCAM Value and Mask for an IP access list?
SC or MT-RJ
Cabling specifications for Gigabit Ethernet
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8)
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

4. What function is performed by the Switching Database Manager (SDM)?
Manually by administratively disabling and re-enabling the port
Partition and tune the TCAM on some Catalyst switches into areas for different functions
15 metres
Encapsulation failure; Unresolved address; Unsupported protocol; No valid route; No valid adjacency; Checksum error

5. Selects an interface-range macro and enters interface configuration mode
10 km
Switch(config)#interface range macro {name}
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]
Distributed CEF (dCEF)

6. What is the content of TCAM Result entries?
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX
Carrier Sense Multiple Access Collision Detection
Numeric values that represent what action to take after the TCAM lookup occurs

7. How is link speed determined on Fast Ethernet links configured to autonegotiate?
Static access or dynamic
FIB with adjacency table
By electrical signalling so that either end of a link can determine what speed the other end is trying to use
LAN PHY and WAN PHY

8. What are the letters used with 10GBASE-X two-letter suffixes to specify the transceiver wavelengths?
Accelerated CEF (aCEF) and Distributed CEF (dCEF)
Switch(config)#errdisable detect cause ilpower
S = Short; L = Long; E = Extra-long
Switch(config)#errdisable detect cause psecure-violation

9. Displays a list with status of all interfaces
UTP Fast Ethernet and Gigabit Ethernet
Switch#show interfaces status
Down - static access - trunk or tunnel
IEEE 802.3ab

10. How are MAC addresses shown in the detailed output from the CEF adjacency table?
10GbE operates only at full duplex
Switch(config)#errdisable detect cause storm-control
XENPAK - X2 - or SFP+
Adjacent MAC address (6 octets); Layer 3 engine MAC address (6 octets); EtherType (2 octets)

11. What fields are rewritten in hardware before a Layer 3 packet is switched to the to egress queue of a multilayer switch?
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
Switch(config-if)#switchport access vlan {vlan}
Layer 2 source and destination MAC addresses; Layer 3 Time-To-Live (TTL) value and header checksum
Switch#clear mac address-table [dynamic] [address {mac-address}] [interface {interface}] [vlan {vlan}]

12. Enables error-disable for when the port link state is flapping between the up and down states
Switch#show running-config interface {interface}
Switch(config)#no ip cef
Switch(config)#errdisable detect cause link-flap
Switch#show errdisable recovery

13. Displays administrative and operational status for a specified interface
Switch#show interfaces {interface}
The Discard adjacency
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)
Switch(config)#errdisable detect cause vmps

14. What is 1000BASE-T?
Source MAC address; Port of arrival; VLAN; Time stamp
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP
10 Gigabit Ethernet over 50 or 62.5 micron MMF or 9 micron SMF (1300 nm WWDM laser)
Switch#show adjacency [{interface}] [summary | detail]

15. What is the content of TCAM Mask entries?

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16. Enables error-disable detection
Switch(config)#errdisable detect cause {all | {cause-name}}
Store-and-forward
Cabling specification for 10 Mbps Ethernet over Unshielded Twisted Pair (UTP) cabling
The Drop adjacency

17. Enables error-disable for errors with offering inline power
70 km for 9 micron SMF; 100 km for 8 micron SMF
Down - static access - trunk or tunnel
Switch(config)#errdisable detect cause ilpower
Switch(config-if)#description {string}

18. What are the 100BASE-FX connectors used in Cisco Catalyst switches?
SC or MT-RJ
Switch(config)#errdisable detect cause vmps
In parallel revealing the best (longest) match in a single table lookup
Switch#show mac address-table [address {mac-address}] [interface {interface}] [vlan {vlan}]

19. What is WAN PHY used for?
Interconnecting with existing Synchronous Optical Network (SONET) or Synchronous Digital Hierarchy (SDH) networks
Switch(config-if)#switchport mode access
Ingress queueing; Destination MAC lookup (CAM); Destination IP lookup (FIB); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Layer 3 packet rewrite; Egress queueing
The table of learned MAC addresses - ports - and VLAN information

20. What denotes the number of times a CEF entry has been updated since the CEF table was created?
Source IP (/32); Destination IP (/32); Protocol (/16); ICMP code (/8); ICMP type (/4); IP type of service (ToS) (/8)
The CEF entry version number
On
Static access or trunk

21. What is 100BASE-T2?
In parallel revealing the best (longest) match in a single table lookup
Value - Mask - and Result (VMR)
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP
Switch#show ip cef

22. Disables CEF operation on an interface
Switch(config)#default interface {interface}
Switch#show errdisable recovery
Accelerated CEF (aCEF)
Switch(config-if)#no ip route-cache cef

23. What is the administrative mode of a switch port that uses DTP to negotiate its operational mode?
Wide-Wavelength Division Multiplexing
Feature Manager (FM) and Switching Database Manager (SDM)
Switch(config)#errdisable detect cause storm-control
Dynamic

24. What CEF adjacency is used to switch packets destined for the null interface?
Switch#show adjacency [{interface}] [summary | detail]
400 metres half duplex and 2000 metres full duplex
Switch(config)#errdisable detect cause {all | {cause-name}}
The Null adjacency

25. What is the name of the CEF engine that maintains routing information in software?
The Layer 3 engine
On
300 seconds
Source MAC address; Port of arrival; VLAN; Time stamp

26. What is CSMA/CD?
Carrier Sense Multiple Access Collision Detection
XENPAK - X2 - or SFP+
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
LOU registers

27. What is 100BASE-FX?
Routing table and ARP table
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]
Fast Ethernet over 62.5/125 micron multimode fibre (MMF) or 9 micron singlemode fibre (SMF)
Switch(config-if)#switchport access vlan {vlan}

28. Enables error-disable when a link is seen to be unidirectional
IEEE 802.3u
They are dropped (ARP throttling)
In TCAM Value entries
Switch(config)#errdisable detect cause udld

29. What is 1000BASE-LX/LH?
Switch(config)#mac address-table aging-time {seconds}
IEEE 802.3ae
Feature Manager (FM) and Switching Database Manager (SDM)
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF or 9 micron SMF (1300 nm laser)

30. What are GigaStack GBICs used for?
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF (850 nm laser)
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF

31. What is the DTP negotiation mode of a switch port configured as static access?
FIB with adjacency table
Off
100 metres
American National Standards Institute

32. What is the default duplex mode of a 10 Mbps Ethernet interface?
Switch(config)#mac address-table aging-time {seconds}
Switch#show interfaces {interface} switchport
Configure the appropriate values manually on both ends of the link
Half duplex

33. What is the maximum cabling distance for 1000BASE-ZX?
70 km for 9 micron SMF; 100 km for 8 micron SMF
Switch(config)#errdisable detect cause psecure-violation
Configure the appropriate values manually on both ends of the link
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF

34. Displays the contents of the CAM table
Switch#show mac address-table [address {mac-address}] [interface {interface}] [vlan {vlan}]
Switch#show mac address-table dynamic [address {mac-address}] [interface {interface}] [vlan {vlan}]
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX
Cisco Express Forwarding

35. Displays CEF Punt statistics with number of packets and reason for each line card
Slow response times - low throughput - runts and other input errors on the switch ports
Switch#show cef not-cef-switched
Content-Addressable Memory
Switch#show interfaces status

36. What is CEF?
Switch(config)#errdisable detect cause udld
Switch(config)#no ip cef
Process the first packet in a traffic flow to determine the destination
Cisco Express Forwarding

37. What is the maximum cabling distance for 10GBASE-LX4/LW4?
Switch(config)#errdisable detect cause rootguard
Half duplex
Gigabit Ethernet over 1 pair Shielded Twisted Pair (STP) cabling
300 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF

38. What is the standard for Gigabit Ethernet (1000 Mbps)?
IEEE 802.3z
The table of learned MAC addresses - ports - and VLAN information
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP
Configure the appropriate values manually on both ends of the link

39. What connectors can be used with GBIC modules?
SC fibre optic or RJ-45 UTP
Manually by administratively disabling and re-enabling the port
Packets that have been truncated before they were fully received
LOU registers

40. Adds a description to an interface configuration
Switch(config-if)#description {string}
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance
Mask bits set to 1 for Value bits of interest and 0 for Value bits that don't matter
Switch#show running-config interface {interface}

41. What are the reasons for packets being dropped by CEF?
Switch(config-if)#no switchport
S = Short; L = Long; E = Extra-long
Encapsulation failure; Unresolved address; Unsupported protocol; No valid route; No valid adjacency; Checksum error
Source IP (/32); Destination IP (/32); Protocol (/16); ICMP code (/8); ICMP type (/4); IP type of service (ToS) (/8)

42. What information is stored in TCAM?
IEEE 802.3ab
Security and QoS ACLs
Static access - trunk - tunnel or dynamic
IEEE 802.3z

43. Displays error-disabled detection status
Switch#show errdisable detect
LAN PHY and WAN PHY
Switch#show running-config interface {interface}
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX

44. When can a switch start to learn source MAC addresses on incoming ports?
Native routed interface
When the Spanning Tree Protocol (STP) has put the switch port in learning or forwarding state
Packets that have been truncated before they were fully received
Switch(config)#errdisable detect cause vmps

45. Displays the entire Forwarding Information Base (FIB)
The Null adjacency
Switch#show ip cef
Tunnel
Switch#show ip cef {interface} [detail]

46. Displays CEF adjacency table information
Switch#show running-config interface {interface}
Static access or dynamic
Switch#show adjacency [{interface}] [summary | detail]
The table of learned MAC addresses - ports - and VLAN information

47. Configures the maximum ageing time for entries in the MAC address table
Interconnecting switches in a campus network
Switch(config)#mac address-table aging-time {seconds}
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]
Collision domain

48. How is link duplex mode determined on Fast Ethernet links configured to autonegotiate?
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
Through exchange of information - which means that for one end to successfully negotiate duplex mode the other end must also be set to autonegotiate
On
Switch#show mac address-table static [address {mac-address}] [interface {interface}] [vlan {vlan}]

49. Enables error-disable for errors with dynamic ARP inspection
Switch(config)#errdisable detect cause arp-inspection
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)
The adjacency table
Switch(config)#define interface-range {macro-name} {type} {module}/{number} [- {number}] [ - {type} {module}/{number} ...]

50. What is the TCAM Value and Mask for an IPX access list?
LOU registers
Source IPX network (/32); Destination IPX network (/32); Destination node (/48); IPX packet type (/16)
UTP Fast Ethernet and Gigabit Ethernet
Content-Addressable Memory