Test your basic knowledge |

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 connectors can be used with GBIC modules?
SC fibre optic or RJ-45 UTP
Switch(config)#errdisable detect cause storm-control
Tunnel
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP

2. What is the TCAM Value and Mask for an ICMP access list?
Electromagnetic Interference
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP
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
Source IP (/32); Destination IP (/32); Protocol (/16); ICMP code (/8); ICMP type (/4); IP type of service (ToS) (/8)

3. Enables automatic re-enabling of error-disabled ports
Switch(config)#errdisable recovery cause {all | {cause-name}}
Source MAC address; Port of arrival; VLAN; Time stamp
Security and QoS ACLs
The Discard adjacency

4. What is Cisco's old recommendation regarding switch port speed and duplex mode?
Switch#show interfaces status err-disabled
Configure the appropriate values manually on both ends of the link
The CEF entry version number
Switch#show ip cef {interface} [detail]

5. What is the operational mode of a switch port that carries traffic for multiple VLANs?
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
Trunk
Switch(config)#errdisable detect cause loopback
XENPAK - X2 - or SFP+

6. Adds a static entry to the MAC address table
10 km
Partition and tune the TCAM on some Catalyst switches into areas for different functions
Switch(config)#mac address-table static {mac-address} vlan {vlan} interface {interface}
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

7. What are the letters used with 10GBASE-X two-letter suffixes to specify the transceiver wavelengths?
Switch(config)#errdisable recovery interval {seconds}
Trunk
S = Short; L = Long; E = Extra-long
Switch#show mac address-table dynamic [address {mac-address}] [interface {interface}] [vlan {vlan}]

8. When can a switch start to learn source MAC addresses on incoming ports?
Switch(config-if)#switchport mode access
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF or 9 micron SMF (1300 nm laser)
CEF glean
When the Spanning Tree Protocol (STP) has put the switch port in learning or forwarding state

9. What technology was merged into the IEEE 802.3 Ethernet standard to create Gigabit Ethernet?
ANSI X3T11 FibreChannel
Static access - trunk - tunnel or dynamic
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding
Carrier Sense Multiple Access Collision Detection

10. How are the TCAM Mask/Value pairs evaluated?
In parallel revealing the best (longest) match in a single table lookup
Switch(config-if)#speed {10 | 100 | 1000 | auto}
Switch(config-if)#switchport mode access
Value - Mask - and Result (VMR)

11. What are the types of layer 3 switched interfaces
Switch#show ip cef {interface} [detail]
They are dropped (ARP throttling)
Switch#show running-config interface {interface}
SVI or native routed interface

12. Enables error-disable for conditions that trigger unicast flood blocking on a port
IEEE 802.3ab
CEF glean
Switch(config)#errdisable detect cause unicast-flood
Switch(config)#errdisable detect cause arp-inspection

13. What is FIB?
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
Forwarding Information Base
Switch(config-if)#switchport mode access
By electrical signalling so that either end of a link can determine what speed the other end is trying to use

14. Displays CEF Drop statistics with number of packets and reason for each line card
Switch#show cef drop
Full duplex
Enable error-disable for all possible causes
Switch(config)#interface {type}{module}/{number}

15. What is the DTP negotiation mode of a switch port configured as trunk?
The CEF epoch number
Electromagnetic Interference
Switch#show errdisable detect
On

16. Disables CEF operation globally
Switch(config)#define interface-range {macro-name} {type} {module}/{number} [- {number}] [ - {type} {module}/{number} ...]
Switch(config)#errdisable detect cause security-violation
Switch(config)#no ip cef
25 metres

17. What is the default duplex mode of a Fast Ethernet interface?
Switch#show mac address-table [address {mac-address}] [interface {interface}] [vlan {vlan}]
Half duplex
Accelerated CEF (aCEF) and Distributed CEF (dCEF)
On

18. What function is performed by the Feature Manager (FM)?
Creating the VLAN
1000BASE-CX - 1000BASE-T - 1000-BASE-SX - 1000-BASE-LX/LH and 1000-BASE-ZX
Compiling Access Control Entries (ACE) into the TCAM table
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

19. What function is performed by the Switching Database Manager (SDM)?
Switch(config-if)#description {string}
Partition and tune the TCAM on some Catalyst switches into areas for different functions
Switch#show interfaces status
Switch#show interfaces {interface}

20. Displays a list of all interfaces in an error-disabled state
When one station transmits at the same time as another on a shared medium
IEEE 802.3ab
Switch#show interfaces status err-disabled
The Layer 3 forwarding engine

21. What is 100BASE-T4?
Fast Ethernet over 62.5/125 micron multimode fibre (MMF) or 9 micron singlemode fibre (SMF)
Slow response times - low throughput - runts and other input errors on the switch ports
Fast Ethernet over 4 pairs EIA/TIA Category 3 - 4 - 5 UTP
Switch#show ip cef

22. What are the common cabling specifications for Gigabit Ethernet?
The Discard adjacency
1000BASE-CX - 1000BASE-T - 1000-BASE-SX - 1000-BASE-LX/LH and 1000-BASE-ZX
10 km
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance

23. What is the administrative mode of a switch port that carries traffic for multiple VLANs?
Wide-Wavelength Division Multiplexing
Trunk or dynamic
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance
Forwarding Information Base

24. Displays CEF Punt statistics with number of packets and reason for each line card
Switch(config)#mac address-table static {mac-address} vlan {vlan} interface {interface}
Switch#show interfaces status
IEEE 802.3z
Switch#show cef not-cef-switched

25. What tables are maintained by the CEF Layer 3 engine?
Multilayer Switching
SVI
When the Spanning Tree Protocol (STP) has put the switch port in learning or forwarding state
Routing table and ARP table

26. What is error-disable state?
Static access
From 30 seconds to 86 -400 seconds (24 hours)
A switch port that has been shut down automatically due to a serious error condition
IEEE 802.3ae

27. What are the supported duplex mode settings for Gigabit Ethernet on Cisco switches?
Switch(config)#errdisable detect cause gbic-invalid
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX
25 metres
Full duplex only

28. What is the standard for 10 Gigabit Ethernet (10GbE)?
Switch#show interfaces status
IEEE 802.3ae
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)
Value - Mask - and Result (VMR)

29. What is the operational mode of a switch port that uses DTP negotiation?
They are dropped (ARP throttling)
Static access or trunk
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8)
10 km

30. Displays error-disabled detection status
Switch(config)#interface vlan {vlan-id}
Full duplex if only one of the two stacking connectors is used; Half duplex over a shared bus if if both connectors are used
American National Standards Institute
Switch#show errdisable detect

31. What is EMI?
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
Electromagnetic Interference
R = LAN PHY; W = WAN PHY
Switch#show cef drop

32. What are the operational modes of a Layer 2 switched interface?
IEEE 802.3ae
Switch(config)#errdisable detect cause link-flap
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF or 9 micron SMF (1300 nm laser)
Down - static access - trunk or tunnel

33. What are the 1000BASE-X transceiver module form factors used in Cisco Catalyst switches?
UTP Fast Ethernet and Gigabit Ethernet
10 Gigabit Ethernet over 50 or 62.5 micron MMF or 9 micron SMF (1300 nm WWDM laser)
Full duplex if only one of the two stacking connectors is used; Half duplex over a shared bus if if both connectors are used
Gigabit Interface Converter (GBIC) or Small Form factor Pluggable (SFP)

34. What is the TCAM Value and Mask for an extended IP access list using TCP/UDP?
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)
Carrier Sense Multiple Access Collision Detection
Half duplex

35. What is 1000BASE-T?
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP
The switch port falls back to default setting of half duplex
Cabling specifications for 10 Gigabit Ethernet
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]

36. What is the maximum cabling distance for Fast Ethernet over 62.5/125 micron multimode fibre?
Configure the appropriate values manually on both ends of the link
Half duplex
400 metres half duplex and 2000 metres full duplex
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF or 9 micron SMF (1300 nm laser)

37. What is an interface-range macro?
Switch(config)#errdisable detect cause channel-misconfig
A name assigned to a ranges of interfaces
On
Full duplex

38. What is Fast EtherChannel (FEC)?
Bundling together two to eight full duplex Fast Ethernet links to act as a single physical link
15 metres
Switch(config)#errdisable detect cause channel-misconfig
Switch(config)#errdisable detect cause storm-control

39. When are mode-conditioning patch leads required with 1000BASE-LX/LH transceivers?
Switch#show cef drop
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)
Switch(config)#errdisable detect cause vmps
Switch(config-if)#description {string}

40. What is 10GBASE-CX4?
10 Gigabit Ethernet over copper CX4 with Infiniband connectors
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
XENPAK - X2 - or SFP+
Cabling specifications for 10 Gigabit Ethernet

41. What CEF adjacency is used when packets must be sent to the Layer 3 engine for further processing?
The Punt adjacency
Numeric values that represent what action to take after the TCAM lookup occurs
100 metres
Value - Mask - and Result (VMR)

42. What combinations are TCAM entries composed of?
Trunk or dynamic
Interconnecting with existing Synchronous Optical Network (SONET) or Synchronous Digital Hierarchy (SDH) networks
Value - Mask - and Result (VMR)
Switch#clear mac address-table [dynamic] [address {mac-address}] [interface {interface}] [vlan {vlan}]

43. What denotes the number of times a CEF entry has been updated since the CEF table was created?
When one station transmits at the same time as another on a shared medium
The CEF entry version number
Ternary Content-Addressable Memory
Native routed interface

44. What is 10BASE-T?
Switch#show cef drop
Cabling specification for 10 Mbps Ethernet over Unshielded Twisted Pair (UTP) cabling
Static access or dynamic
The table of learned MAC addresses - ports - and VLAN information

45. Enables error-disable for errors when assigning a port to a dynamic VLAN through a VMPS
Switch(config-if)#no ip route-cache cef
Switch(config)#errdisable detect cause vmps
15 metres
Switch(config)#errdisable detect cause udld

46. What happens when autonegotiating of link duplex mode fails on a Fast Ethernet link?
The switch port falls back to default setting of half duplex
LC - MT-RJ or RJ-45
Half duplex
American National Standards Institute

47. What is 1000BASE-ZX?
Cabling specifications for Gigabit Ethernet
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)
SVI or native routed interface
The Punt adjacency

48. Displays administrative and operational status for a specified interface
Switch#show interfaces {interface}
Layer 2 source and destination MAC addresses; Layer 3 Time-To-Live (TTL) value and header checksum
By Mask/Value - where each unique mask has eight value patterns associated with it
CEF glean

49. Specifies the timer for automatic re-enabling of error-disabled ports
Switch(config)#errdisable detect cause psecure-violation
Switch(config)#errdisable recovery interval {seconds}
Switch#show mac address-table dynamic [address {mac-address}] [interface {interface}] [vlan {vlan}]
Switch#show interfaces status err-disabled

50. What is the TCAM Value and Mask for an Ethernet access list?
300 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
Partition and tune the TCAM on some Catalyst switches into areas for different functions
The Discard adjacency
Source MAC (/48); Destination MAC (/48); Ethertype (/16)