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 happens when autonegotiating of link duplex mode fails on a Fast Ethernet link?
The Layer 3 forwarding engine
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}]
The switch port falls back to default setting of half duplex

2. What is 10GBASE-ER/EW?
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)
Switch(config)#errdisable detect cause security-violation
400 metres half duplex and 2000 metres full duplex
Off

3. What are the 1000BASE-X transceiver module form factors used in Cisco Catalyst switches?
Half duplex
The CEF epoch number
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
Gigabit Interface Converter (GBIC) or Small Form factor Pluggable (SFP)

4. What are runts?
Packets that have been truncated before they were fully received
Switch#show mac address-table [address {mac-address}] [interface {interface}] [vlan {vlan}]
The CEF epoch number
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF

5. What is the administrative mode of a switch port that carries transparent Layer 2 VPNs?
70 km for 9 micron SMF; 100 km for 8 micron SMF
Switch(config-if)#speed {10 | 100 | 1000 | auto}
Tunnel
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX

6. What is the state of packets that are sent to the CEF Layer 3 engine because of missing Layer 2 next-hop addresses?
10GBASE-SR/SW - 10GBASE-LR/LW - 10GBASE-ER/EW - 10GBASE-LX4/LW4 - 10GBASE-CX4
CEF glean
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
Half duplex

7. What is the timer range for automatic re-enabling of error-disabled ports?
From 30 seconds to 86 -400 seconds (24 hours)
Half duplex
Security and QoS ACLs
Wide-Wavelength Division Multiplexing

8. What denotes the number of times a CEF entry has been updated since the CEF table was created?
ANSI X3T11 FibreChannel
Switch(config)#errdisable detect cause l2ptguard
10GbE operates only at full duplex
The CEF entry version number

9. Changes an interface to a layer 3 interface and erases all layer 2 interface configurations
Switch(config-if)#no switchport
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding
A name assigned to a ranges of interfaces
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance

10. Enables error-disable for errors with offering inline power
Static access
IEEE 802.3ae
Switch(config)#errdisable detect cause ilpower
1000BASE-T full duplex followed by 1000BASE-T half duplex

11. When should CEF be disabled?
10 Gigabit Ethernet over 9 micron SMF (1310 nm serial laser)
When the Spanning Tree Protocol (STP) has put the switch port in learning or forwarding state
When one station transmits at the same time as another on a shared medium
Only temporarily for debugging purposes

12. What is the TCAM Value and Mask for an IPX access list?
Switch#show interfaces {interface} switchport
Switch(config-if)#switchport access vlan {vlan}
Half duplex
Source IPX network (/32); Destination IPX network (/32); Destination node (/48); IPX packet type (/16)

13. What is the DTP negotiation mode of a switch port configured as trunk?
On
Half duplex
Configure the appropriate values manually on both ends of the link
A name assigned to a ranges of interfaces

14. When can a switch start to learn source MAC addresses on incoming ports?
Switch(config)#interface range macro {name}
Switch(config)#interface {type}{module}/{number}
Fast Ethernet over 62.5/125 micron multimode fibre (MMF) or 9 micron singlemode fibre (SMF)
When the Spanning Tree Protocol (STP) has put the switch port in learning or forwarding state

15. What are the Fast Ethernet autonegotiation selection priorities?
Tunnel
Switch(config)#errdisable detect cause arp-inspection
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
IEEE 802.3ab

16. What Ethernet ports allow for autonegotiation?
UTP Fast Ethernet and Gigabit Ethernet
Switch(config)#errdisable detect cause arp-inspection
Switch(config)#errdisable detect cause dtp-flap
IEEE 802.3ab

17. What is 1000BASE-X?
By electrical signalling so that either end of a link can determine what speed the other end is trying to use
Switch(config)#interface vlan {vlan-id}
Half duplex
Cabling specifications for Gigabit Ethernet

18. Displays CEF Punt statistics with number of packets and reason for each line card
Through exchange of information - which means that for one end to successfully negotiate duplex mode the other end must also be set to autonegotiate
Switch#show cef not-cef-switched
Switch(config-if)#switchport mode access
Switch#clear mac address-table [dynamic] [address {mac-address}] [interface {interface}] [vlan {vlan}]

19. How are ternary combinations implemented?
With a mask value in addition to binary values to decide which keys in a table are relevant
When the Spanning Tree Protocol (STP) has put the switch port in learning or forwarding state
Institute of Electrical and Electronics Engineers
Switch(config)#define interface-range {macro-name} {type} {module}/{number} [- {number}] [ - {type} {module}/{number} ...]

20. What are the classes of Physical Media Dependent (PMD) interfaces defined by IEEE 802.3ae?
Switch#show mac address-table count [address {mac-address}] [interface {interface}] [vlan {vlan}]
Encapsulation failure; Unresolved address; Unsupported protocol; No valid route; No valid adjacency; Checksum error
On
LAN PHY and WAN PHY

21. What is TCAM overflow?
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX
Manually by administratively disabling and re-enabling the port
When there are more access list entries and Layer 4 operations than available Mask/Value and LOU entries
10 Gigabit Ethernet over 9 micron SMF (1310 nm serial laser)

22. What is the content of TCAM Result entries?
Switch#clear mac address-table [dynamic] [address {mac-address}] [interface {interface}] [vlan {vlan}]
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
A name assigned to a ranges of interfaces

23. Enables error-disable for misconfiguration of EtherChannel bundles
Switch(config)#errdisable detect cause loopback
Switch(config-if)#no switchport
Switch(config)#errdisable detect cause channel-misconfig
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX

24. What is the prerequesite for creating a working SVI?
When one station transmits at the same time as another on a shared medium
SC or MT-RJ
Creating the VLAN
Fast Ethernet over 4 pairs EIA/TIA Category 3 - 4 - 5 UTP

25. What information is stored in TCAM?
Carrier Sense Multiple Access Collision Detection
Native routed interface
When one station transmits at the same time as another on a shared medium
Security and QoS ACLs

26. What is an interface-range macro?
A name assigned to a ranges of interfaces
Route caching and topology based
Switch(config-if)#description {string}
Switch(config)#errdisable detect cause security-violation

27. Enables error-disable for Bridge Protocol Data Units (BPDU) received on ports configured for STP PortFast
Switch(config)#errdisable detect cause bpduguard
Switch(config)#errdisable detect cause dhcp-rate-limit
IEEE 802.3ab
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

28. Enables error-disable for errors with Layer 2 Protocol Tunnelling
Switch(config)#interface range macro {name}
The Drop adjacency
Switch#show mac address-table [address {mac-address}] [interface {interface}] [vlan {vlan}]
Switch(config)#errdisable detect cause l2ptguard

29. What is TCAM?
Ternary Content-Addressable Memory
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
Trunk or dynamic
They are dropped (ARP throttling)

30. What are the administrative modes of Layer 2 switched interfaces?
Static access - trunk - tunnel or dynamic
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
LC - MT-RJ or RJ-45
275 metres for 62.5 micron MMF; 550 metres for 50 micron MMF

31. What is MLS?
1 -2 on one end with 3 -6 on the other end
IEEE 802.3u
1000BASE-CX - 1000BASE-T - 1000-BASE-SX - 1000-BASE-LX/LH and 1000-BASE-ZX
Multilayer Switching

32. What is 100BASE-TX?
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
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance
Fast Ethernet over 2 pairs EIA/TIA Category 5 UTP
Fast Ethernet over 62.5/125 micron multimode fibre (MMF) or 9 micron singlemode fibre (SMF)

33. Enables error-disable for errors with dynamic ARP inspection
ANSI X3T11 FibreChannel
Switch(config)#interface vlan {vlan-id}
Stations can transmit and receive at the same time because switched Ethernet removes the possibility of collisions
Switch(config)#errdisable detect cause arp-inspection

34. What is the maximum cabling distance for 10GBASE-LX4/LW4?
UTP Fast Ethernet and Gigabit Ethernet
A name assigned to a ranges of interfaces
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF or 9 micron SMF (1300 nm laser)
300 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF

35. Enables error-disable detection
In parallel revealing the best (longest) match in a single table lookup
Switch(config)#errdisable detect cause dtp-flap
Switch(config)#errdisable detect cause {all | {cause-name}}
Switch(config-if)#no switchport

36. What is the name of the CEF engine that forwards packets in hardware?
Switch#show errdisable detect
Native routed interface
The Layer 3 forwarding engine
With a mask value in addition to binary values to decide which keys in a table are relevant

37. Enables error-disable for rate-limiting of DHCP snooping
Switch(config)#errdisable detect cause dhcp-rate-limit
10 km
The CEF epoch number
Switch#show interfaces {interface}

38. What is 10GBASE-LR/LW?
Process the first packet in a traffic flow to determine the destination
Gigabit Interface Converter (GBIC) or Small Form factor Pluggable (SFP)
The Null adjacency
10 Gigabit Ethernet over 9 micron SMF (1310 nm serial laser)

39. Sets the speed of a Fast Ethernet or Gigabit Ethernet interface
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
The switch port falls back to default setting of half duplex
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF (850 nm laser)
Switch(config-if)#speed {10 | 100 | 1000 | auto}

40. Selects a switch port interface and enters interface configuration mode
1000BASE-T full duplex followed by 1000BASE-T half duplex
Switch(config)#interface {type}{module}/{number}
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)#mac address-table aging-time {seconds}

41. What information is stored in CAM?
A name assigned to a ranges of interfaces
The table of learned MAC addresses - ports - and VLAN information
A three-fold combination of 0 - 1 and X (don't care)
Static access or trunk

42. Enables error-disable when an interface has been looped back
Tunnel
Switch(config)#errdisable detect cause loopback
Through exchange of information - which means that for one end to successfully negotiate duplex mode the other end must also be set to autonegotiate
Switch#show ip cef {interface} [detail]

43. What are the default error-disable detection causes?
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#show errdisable detect
SVI or native routed interface

44. What is WAN PHY used for?
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
Half duplex
Interconnecting with existing Synchronous Optical Network (SONET) or Synchronous Digital Hierarchy (SDH) networks
The Discard adjacency

45. Configures a switch port with a static access VLAN assignment
Switch(config-if)#switchport access vlan {vlan}
Institute of Electrical and Electronics Engineers
400 metres half duplex and 2000 metres full duplex
Content-Addressable Memory

46. Enables error-disable when a link is seen to be unidirectional
Switch#show mac address-table count [address {mac-address}] [interface {interface}] [vlan {vlan}]
Switch#show interfaces {interface}
Cabling specification for 10 Mbps Ethernet over Unshielded Twisted Pair (UTP) cabling
Switch(config)#errdisable detect cause udld

47. What is the maximum cabling distance for 1000BASE-ZX?
S = Short; L = Long; E = Extra-long
American National Standards Institute
70 km for 9 micron SMF; 100 km for 8 micron SMF
Content-Addressable Memory

48. What is Fast EtherChannel (FEC)?
Switch(config)#errdisable detect cause vmps
Bundling together two to eight full duplex Fast Ethernet links to act as a single physical link
Adjacent MAC address (6 octets); Layer 3 engine MAC address (6 octets); EtherType (2 octets)
15 metres

49. What packets are immediately sent to the CEF Layer 3 engine for further processing?

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183

50. Creates an interface-range macro
Switch(config)#errdisable detect cause gbic-invalid
10GBASE-SR/SW - 10GBASE-LR/LW - 10GBASE-ER/EW - 10GBASE-LX4/LW4 - 10GBASE-CX4
Switch(config)#define interface-range {macro-name} {type} {module}/{number} [- {number}] [ - {type} {module}/{number} ...]
Accelerated CEF (aCEF) and Distributed CEF (dCEF)